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Environmental impact articles from across Nature Portfolio

Phosphorus planetary boundary at China’s river-basin scale

Staying within the safe and just planetary boundary of phosphorus in China at the river-basin scale requires a systemic management strategy for the livestock sector.

Greening hydropower in Africa

Hydropower dams offer a pathway for low-carbon energy supply in Africa, yet unchecked dam expansion can harm the environment. A study shows how the integration of different dam environmental concerns into energy system planning can lead to sustainable hydropower development.

• Mohammed Basheer

Climate change and geohazards

Long-term monitoring is required to determine whether climate change is having an impact on shallow geohazard frequency and magnitude; however, these records rarely exist. An innovative approach, using tree damage as evidence, suggests climate change has shifted the seasonality of alpine rockfalls as well as increasing their frequency and volume.

• Anna Harrison
• Claire Dashwood

Latest Research and Reviews

A new scheme for low-carbon recycling of urban and rural organic waste based on carbon footprint assessment: A case study in China

Experimental data on filling and emptying of a large-scale pipeline

• Xifeng Chen
• Qingzhi Hou
• Arris S. Tijsseling

Assessment of sustainable baits for passive fishing gears through automatic fish behavior recognition

• Alexa Sugpatan Abangan
• Kilian Bürgi
• Robin Faillettaz

Prediction of land use for the next 30 years using the PLUS model's multi-scenario simulation in Guizhou Province, China

• Juncong Liu

Study on the ability of indoor plants to absorb and purify benzene pollution

Meta-analysis reveals the effects of microbial inoculants on the biomass and diversity of soil microbial communities

A meta-analysis of 335 studies reveals that microbial inoculants have overall positive effects on the biomass of soil microbial communities. These effects were weakened by environmental stress and strengthened by the use of fertilizers and native inoculants.

• Christoph Müller

News and Comment

The urgent need for designing greener drugs

The pervasive contamination of ecosystems with active pharmaceutical ingredients poses a serious threat to biodiversity, ecosystem services and public health. Urgent action is needed to design greener drugs that maintain efficacy but also minimize environmental impact.

• Tomas Brodin
• Michael G. Bertram
• Gorka Orive

A sustainable protein ratio

Circularity principles and tipping the ratio of animal- to plant-based proteins towards plant-based diets could largely reduce greenhouse gas emissions and land-use change impacts in the EU28, while avoiding micronutrient losses associated with lower animal-based protein intake.

• Jon Sampedro

Challenges associated with greenhouse gas emissions-related food guidance

Dietary patterns make a substantial contribution to greenhouse gas (GHG) emissions. Research is needed to investigate whether these dietary pattern-level GHG emission contributions can be disaggregated into food product-specific GHG emissions estimates and used to encourage citizens to switch from high- to low-emitting foods.

• Mark Lawrence

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2019 Best Papers published in the Environmental Science journals of the Royal Society of Chemistry

In 2019, the Royal Society of Chemistry published 180, 196 and 293 papers in Environmental Science: Processes & Impacts , Environmental Science: Water Research & Technology , and Environmental Science: Nano , respectively. These papers covered a wide range of topics in environmental science, from biogeochemical cycling to water reuse to nanomaterial toxicity. And, yes, we also published papers on the topic of the environmental fate, behavior, and inactivation of viruses. 1–10 We are extremely grateful that so many authors have chosen our journals as outlets for publishing their research and are equally delighted at the high quality of the papers that we have had the privilege to publish.

Our Associate Editors, Editorial Boards, and Advisory Boards were enlisted to nominate and select the best papers from 2019. From this list, the three Editors-in-Chief selected an overall best paper from the entire Environmental Science portfolio. It is our pleasure to present the winners of the Best Papers in 2019 to you, our readers.

Overall Best Paper

In this paper, Johansson et al. examine sea spray aerosol as a potential transport vehicle for perfluoroalkyl carboxylic and sulfonic acids. The surfactant properties of these compounds are well known and, in fact, key to many of the technical applications for which they are used. The fact that these compounds are enriched at the air–water interface makes enrichment in sea spray aerosols seem reasonable. Johansson et al. systematically tested various perfluoroalkyl acids enrichment in aerosols under conditions relevant to sea spray formation, finding that longer chain lengths lead to higher aerosol enrichment factors. They augmented their experimental work with a global model, which further bolstered the conclusion that global transport of perfluoroalkyl acids by sea spray aerosol is and will continue to be an important process in determining the global distribution of these compounds.

Journal Best Papers

Environmental Science: Processes & Impacts

First Runner-up Best Paper: Yamakawa, Takami, Takeda, Kato, Kajii, Emerging investigator series: investigation of mercury emission sources using Hg isotopic compositions of atmospheric mercury at the Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS), Japan , Environ. Sci.: Processes Impacts , 2019, 21 , 809–818, DOI: 10.1039/C8EM00590G .

Second Runner-up Best Paper: Avery, Waring, DeCarlo, Seasonal variation in aerosol composition and concentration upon transport from the outdoor to indoor environment , Environ. Sci.: Processes Impacts , 2019, 21 , 528–547, DOI: 10.1039/C8EM00471D .

Best Review Article: Cousins, Ng, Wang, Scheringer, Why is high persistence alone a major cause of concern? Environ. Sci.: Processes Impacts , 2019, 21 , 781–792, DOI: 10.1039/C8EM00515J .

Environmental Science: Water Research & Technology

First Runner-up Best Paper: Yang, Lin, Tse, Dong, Yu, Hoffmann, Membrane-separated electrochemical latrine wastewater treatment , Environ. Sci.: Water Res. Technol. , 2019, 5 , 51–59, DOI: 10.1039/C8EW00698A .

Second Runner-up Best Paper: Genter, Marks, Clair-Caliot, Mugume, Johnston, Bain, Julian, Evaluation of the novel substrate RUG™ for the detection of Escherichia coli in water from temperate (Zurich, Switzerland) and tropical (Bushenyi, Uganda) field sites , Environ. Sci.: Water Res. Technol. , 2019, 5 , 1082–1091, DOI: 10.1039/C9EW00138G .

Best Review Article: Okoffo, O’Brien, O’Brien, Tscharke, Thomas, Wastewater treatment plants as a source of plastics in the environment: a review of occurrence, methods for identification, quantification and fate , Environ. Sci.: Water Res. Technol. , 2019, 5 , 1908–1931, DOI: 10.1039/C9EW00428A .

Environmental Science: Nano

First Runner-up Best Paper: Janković, Plata, Engineered nanomaterials in the context of global element cycles , Environ. Sci.: Nano , 2019, 6 , 2697–2711, DOI: 10.1039/C9EN00322C .

Second Runner-up Best Paper: González-Pleiter, Tamayo-Belda, Pulido-Reyes, Amariei, Leganés, Rosal, Fernández-Piñas, Secondary nanoplastics released from a biodegradable microplastic severely impact freshwater environments , Environ. Sci.: Nano , 2019, 6 , 1382–1392, DOI: 10.1039/C8EN01427B .

Best Review Article: Lv, Christie, Zhang, Uptake, translocation, and transformation of metal-based nanoparticles in plants: recent advances and methodological challenges , Environ. Sci.: Nano , 2019, 6 , 41–59, DOI: 10.1039/C8EN00645H .

Congratulations to the authors of these papers and a hearty thanks to all of our authors. As one can clearly see from the papers listed above, environmental science is a global effort and we are thrilled to have contributions from around the world. In these challenging times, we are proud to publish research that is not only great science, but also relevant to the health of the environment and the public. Finally, we also wish to extend our thanks to our community of editors, reviewers, and readers. We look forward to another outstanding year of Environmental Science , reading the work generated not just from our offices at home, but also from back in our laboratories and the field.

Kris McNeill, Editor-in-Chief

Paige Novak, Editor-in-Chief

Peter Vikesland, Editor-in-Chief

• A. B Boehm, Risk-based water quality thresholds for coliphages in surface waters: effect of temperature and contamination aging, Environ. Sci.: Processes Impacts , 2019, 21 , 2031–2041,   10.1039/C9EM00376B .
• L. Cai, C. Liu, G. Fan, C Liu and X. Sun, Preventing viral disease by ZnONPs through directly deactivating TMV and activating plant immunity in Nicotiana benthamiana , Environ. Sci.: Nano , 2019, 6 , 3653–3669,   10.1039/C9EN00850K .
• L. W. Gassie, J. D. Englehardt, N. E. Brinkman, J. Garland and M. K. Perera, Ozone-UV net-zero water wash station for remote emergency response healthcare units: design, operation, and results, Environ. Sci.: Water Res. Technol. , 2019, 5 , 1971–1984,   10.1039/C9EW00126C .
• L. M. Hornstra, T. Rodrigues da Silva, B. Blankert, L. Heijnen, E. Beerendonk, E. R. Cornelissen and G. Medema, Monitoring the integrity of reverse osmosis membranes using novel indigenous freshwater viruses and bacteriophages, Environ. Sci.: Water Res. Technol. , 2019, 5 , 1535–1544,   10.1039/C9EW00318E .
• A. H. Hassaballah, J. Nyitrai, C. H. Hart, N. Dai and L. M. Sassoubre, A pilot-scale study of peracetic acid and ultraviolet light for wastewater disinfection, Environ. Sci.: Water Res. Technol. , 2019, 5 , 1453–1463,   10.1039/C9EW00341J .
• W. Khan, J.-Y. Nam, H. Woo, H. Ryu, S. Kim, S. K. Maeng and H.-C. Kim, A proof of concept study for wastewater reuse using bioelectrochemical processes combined with complementary post-treatment technologies, Environ. Sci.: Water Res. Technol. , 2019, 5 , 1489–1498,   10.1039/C9EW00358D .
• J. Heffron, B. McDermid and B. K. Mayer, Bacteriophage inactivation as a function of ferrous iron oxidation, Environ. Sci.: Water Res. Technol. , 2019, 5 , 1309–1317,   10.1039/C9EW00190E .
• S. Torii, T. Hashimoto, A. T. Do, H. Furumai and H. Katayama, Impact of repeated pressurization on virus removal by reverse osmosis membranes for household water treatment, Environ. Sci.: Water Res. Technol. , 2019, 5 , 910–919,   10.1039/C8EW00944A .
• J. Miao, H.-J. Jiang, Z.-W. Yang, D.-y. Shi, D. Yang, Z.-Q. Shen, J. Yin, Z.-G. Qiu, H.-R. Wang, J.-W. Li and M. Jin, Assessment of an electropositive granule media filter for concentrating viruses from large volumes of coastal water, Environ. Sci.: Water Res. Technol. , 2019, 5 , 325–333,   10.1039/C8EW00699G .
• K. L. Nelson, A. B. Boehm, R. J. Davies-Colley, M. C. Dodd, T. Kohn, K. G. Linden, Y. Liu, P. A. Maraccini, K. McNeill, W. A. Mitch, T. H. Nguyen, K. M. Parker, R. A. Rodriguez, L. M. Sassoubre, A. I. Silverman, K. R. Wigginton and R. G. Zepp, Sunlight mediated inactivation of health relevant microorganisms in water: a review of mechanisms and modeling approaches, Environ. Sci.: Processes Impacts , 2018, 20 , 1089–1122,   10.1039/C8EM00047F .

REVIEW article

Environmental and health impacts of air pollution: a review.

• 1 Delphis S.A., Kifisia, Greece
• 2 Laboratory of Hygiene and Environmental Protection, Faculty of Medicine, Democritus University of Thrace, Alexandroupolis, Greece
• 3 Centre Hospitalier Universitaire Vaudois (CHUV), Service de Médicine Interne, Lausanne, Switzerland
• 4 School of Social and Political Sciences, University of Glasgow, Glasgow, United Kingdom

One of our era's greatest scourges is air pollution, on account not only of its impact on climate change but also its impact on public and individual health due to increasing morbidity and mortality. There are many pollutants that are major factors in disease in humans. Among them, Particulate Matter (PM), particles of variable but very small diameter, penetrate the respiratory system via inhalation, causing respiratory and cardiovascular diseases, reproductive and central nervous system dysfunctions, and cancer. Despite the fact that ozone in the stratosphere plays a protective role against ultraviolet irradiation, it is harmful when in high concentration at ground level, also affecting the respiratory and cardiovascular system. Furthermore, nitrogen oxide, sulfur dioxide, Volatile Organic Compounds (VOCs), dioxins, and polycyclic aromatic hydrocarbons (PAHs) are all considered air pollutants that are harmful to humans. Carbon monoxide can even provoke direct poisoning when breathed in at high levels. Heavy metals such as lead, when absorbed into the human body, can lead to direct poisoning or chronic intoxication, depending on exposure. Diseases occurring from the aforementioned substances include principally respiratory problems such as Chronic Obstructive Pulmonary Disease (COPD), asthma, bronchiolitis, and also lung cancer, cardiovascular events, central nervous system dysfunctions, and cutaneous diseases. Last but not least, climate change resulting from environmental pollution affects the geographical distribution of many infectious diseases, as do natural disasters. The only way to tackle this problem is through public awareness coupled with a multidisciplinary approach by scientific experts; national and international organizations must address the emergence of this threat and propose sustainable solutions.

Approach to the Problem

The interactions between humans and their physical surroundings have been extensively studied, as multiple human activities influence the environment. The environment is a coupling of the biotic (living organisms and microorganisms) and the abiotic (hydrosphere, lithosphere, and atmosphere).

Pollution is defined as the introduction into the environment of substances harmful to humans and other living organisms. Pollutants are harmful solids, liquids, or gases produced in higher than usual concentrations that reduce the quality of our environment.

Human activities have an adverse effect on the environment by polluting the water we drink, the air we breathe, and the soil in which plants grow. Although the industrial revolution was a great success in terms of technology, society, and the provision of multiple services, it also introduced the production of huge quantities of pollutants emitted into the air that are harmful to human health. Without any doubt, the global environmental pollution is considered an international public health issue with multiple facets. Social, economic, and legislative concerns and lifestyle habits are related to this major problem. Clearly, urbanization and industrialization are reaching unprecedented and upsetting proportions worldwide in our era. Anthropogenic air pollution is one of the biggest public health hazards worldwide, given that it accounts for about 9 million deaths per year ( 1 ).

Without a doubt, all of the aforementioned are closely associated with climate change, and in the event of danger, the consequences can be severe for mankind ( 2 ). Climate changes and the effects of global planetary warming seriously affect multiple ecosystems, causing problems such as food safety issues, ice and iceberg melting, animal extinction, and damage to plants ( 3 , 4 ).

Air pollution has various health effects. The health of susceptible and sensitive individuals can be impacted even on low air pollution days. Short-term exposure to air pollutants is closely related to COPD (Chronic Obstructive Pulmonary Disease), cough, shortness of breath, wheezing, asthma, respiratory disease, and high rates of hospitalization (a measurement of morbidity).

The long-term effects associated with air pollution are chronic asthma, pulmonary insufficiency, cardiovascular diseases, and cardiovascular mortality. According to a Swedish cohort study, diabetes seems to be induced after long-term air pollution exposure ( 5 ). Moreover, air pollution seems to have various malign health effects in early human life, such as respiratory, cardiovascular, mental, and perinatal disorders ( 3 ), leading to infant mortality or chronic disease in adult age ( 6 ).

National reports have mentioned the increased risk of morbidity and mortality ( 1 ). These studies were conducted in many places around the world and show a correlation between daily ranges of particulate matter (PM) concentration and daily mortality. Climate shifts and global planetary warming ( 3 ) could aggravate the situation. Besides, increased hospitalization (an index of morbidity) has been registered among the elderly and susceptible individuals for specific reasons. Fine and ultrafine particulate matter seems to be associated with more serious illnesses ( 6 ), as it can invade the deepest parts of the airways and more easily reach the bloodstream.

Air pollution mainly affects those living in large urban areas, where road emissions contribute the most to the degradation of air quality. There is also a danger of industrial accidents, where the spread of a toxic fog can be fatal to the populations of the surrounding areas. The dispersion of pollutants is determined by many parameters, most notably atmospheric stability and wind ( 6 ).

In developing countries ( 7 ), the problem is more serious due to overpopulation and uncontrolled urbanization along with the development of industrialization. This leads to poor air quality, especially in countries with social disparities and a lack of information on sustainable management of the environment. The use of fuels such as wood fuel or solid fuel for domestic needs due to low incomes exposes people to bad-quality, polluted air at home. It is of note that three billion people around the world are using the above sources of energy for their daily heating and cooking needs ( 8 ). In developing countries, the women of the household seem to carry the highest risk for disease development due to their longer duration exposure to the indoor air pollution ( 8 , 9 ). Due to its fast industrial development and overpopulation, China is one of the Asian countries confronting serious air pollution problems ( 10 , 11 ). The lung cancer mortality observed in China is associated with fine particles ( 12 ). As stated already, long-term exposure is associated with deleterious effects on the cardiovascular system ( 3 , 5 ). However, it is interesting to note that cardiovascular diseases have mostly been observed in developed and high-income countries rather than in the developing low-income countries exposed highly to air pollution ( 13 ). Extreme air pollution is recorded in India, where the air quality reaches hazardous levels. New Delhi is one of the more polluted cities in India. Flights in and out of New Delhi International Airport are often canceled due to the reduced visibility associated with air pollution. Pollution is occurring both in urban and rural areas in India due to the fast industrialization, urbanization, and rise in use of motorcycle transportation. Nevertheless, biomass combustion associated with heating and cooking needs and practices is a major source of household air pollution in India and in Nepal ( 14 , 15 ). There is spatial heterogeneity in India, as areas with diverse climatological conditions and population and education levels generate different indoor air qualities, with higher PM 2.5 observed in North Indian states (557–601 μg/m 3 ) compared to the Southern States (183–214 μg/m 3 ) ( 16 , 17 ). The cold climate of the North Indian areas may be the main reason for this, as longer periods at home and more heating are necessary compared to in the tropical climate of Southern India. Household air pollution in India is associated with major health effects, especially in women and young children, who stay indoors for longer periods. Chronic obstructive respiratory disease (CORD) and lung cancer are mostly observed in women, while acute lower respiratory disease is seen in young children under 5 years of age ( 18 ).

Accumulation of air pollution, especially sulfur dioxide and smoke, reaching 1,500 mg/m3, resulted in an increase in the number of deaths (4,000 deaths) in December 1952 in London and in 1963 in New York City (400 deaths) ( 19 ). An association of pollution with mortality was reported on the basis of monitoring of outdoor pollution in six US metropolitan cities ( 20 ). In every case, it seems that mortality was closely related to the levels of fine, inhalable, and sulfate particles more than with the levels of total particulate pollution, aerosol acidity, sulfur dioxide, or nitrogen dioxide ( 20 ).

Furthermore, extremely high levels of pollution are reported in Mexico City and Rio de Janeiro, followed by Milan, Ankara, Melbourne, Tokyo, and Moscow ( 19 ).

Based on the magnitude of the public health impact, it is certain that different kinds of interventions should be taken into account. Success and effectiveness in controlling air pollution, specifically at the local level, have been reported. Adequate technological means are applied considering the source and the nature of the emission as well as its impact on health and the environment. The importance of point sources and non-point sources of air pollution control is reported by Schwela and Köth-Jahr ( 21 ). Without a doubt, a detailed emission inventory must record all sources in a given area. Beyond considering the above sources and their nature, topography and meteorology should also be considered, as stated previously. Assessment of the control policies and methods is often extrapolated from the local to the regional and then to the global scale. Air pollution may be dispersed and transported from one region to another area located far away. Air pollution management means the reduction to acceptable levels or possible elimination of air pollutants whose presence in the air affects our health or the environmental ecosystem. Private and governmental entities and authorities implement actions to ensure the air quality ( 22 ). Air quality standards and guidelines were adopted for the different pollutants by the WHO and EPA as a tool for the management of air quality ( 1 , 23 ). These standards have to be compared to the emissions inventory standards by causal analysis and dispersion modeling in order to reveal the problematic areas ( 24 ). Inventories are generally based on a combination of direct measurements and emissions modeling ( 24 ).

As an example, we state here the control measures at the source through the use of catalytic converters in cars. These are devices that turn the pollutants and toxic gases produced from combustion engines into less-toxic pollutants by catalysis through redox reactions ( 25 ). In Greece, the use of private cars was restricted by tracking their license plates in order to reduce traffic congestion during rush hour ( 25 ).

Concerning industrial emissions, collectors and closed systems can keep the air pollution to the minimal standards imposed by legislation ( 26 ).

Current strategies to improve air quality require an estimation of the economic value of the benefits gained from proposed programs. These proposed programs by public authorities, and directives are issued with guidelines to be respected.

In Europe, air quality limit values AQLVs (Air Quality Limit Values) are issued for setting off planning claims ( 27 ). In the USA, the NAAQS (National Ambient Air Quality Standards) establish the national air quality limit values ( 27 ). While both standards and directives are based on different mechanisms, significant success has been achieved in the reduction of overall emissions and associated health and environmental effects ( 27 ). The European Directive identifies geographical areas of risk exposure as monitoring/assessment zones to record the emission sources and levels of air pollution ( 27 ), whereas the USA establishes global geographical air quality criteria according to the severity of their air quality problem and records all sources of the pollutants and their precursors ( 27 ).

In this vein, funds have been financing, directly or indirectly, projects related to air quality along with the technical infrastructure to maintain good air quality. These plans focus on an inventory of databases from air quality environmental planning awareness campaigns. Moreover, pollution measures of air emissions may be taken for vehicles, machines, and industries in urban areas.

Technological innovation can only be successful if it is able to meet the needs of society. In this sense, technology must reflect the decision-making practices and procedures of those involved in risk assessment and evaluation and act as a facilitator in providing information and assessments to enable decision makers to make the best decisions possible. Summarizing the aforementioned in order to design an effective air quality control strategy, several aspects must be considered: environmental factors and ambient air quality conditions, engineering factors and air pollutant characteristics, and finally, economic operating costs for technological improvement and administrative and legal costs. Considering the economic factor, competitiveness through neoliberal concepts is offering a solution to environmental problems ( 22 ).

The development of environmental governance, along with technological progress, has initiated the deployment of a dialogue. Environmental politics has created objections and points of opposition between different political parties, scientists, media, and governmental and non-governmental organizations ( 22 ). Radical environmental activism actions and movements have been created ( 22 ). The rise of the new information and communication technologies (ICTs) are many times examined as to whether and in which way they have influenced means of communication and social movements such as activism ( 28 ). Since the 1990s, the term “digital activism” has been used increasingly and in many different disciplines ( 29 ). Nowadays, multiple digital technologies can be used to produce a digital activism outcome on environmental issues. More specifically, devices with online capabilities such as computers or mobile phones are being used as a way to pursue change in political and social affairs ( 30 ).

In the present paper, we focus on the sources of environmental pollution in relation to public health and propose some solutions and interventions that may be of interest to environmental legislators and decision makers.

Sources of Exposure

It is known that the majority of environmental pollutants are emitted through large-scale human activities such as the use of industrial machinery, power-producing stations, combustion engines, and cars. Because these activities are performed at such a large scale, they are by far the major contributors to air pollution, with cars estimated to be responsible for approximately 80% of today's pollution ( 31 ). Some other human activities are also influencing our environment to a lesser extent, such as field cultivation techniques, gas stations, fuel tanks heaters, and cleaning procedures ( 32 ), as well as several natural sources, such as volcanic and soil eruptions and forest fires.

The classification of air pollutants is based mainly on the sources producing pollution. Therefore, it is worth mentioning the four main sources, following the classification system: Major sources, Area sources, Mobile sources, and Natural sources.

Major sources include the emission of pollutants from power stations, refineries, and petrochemicals, the chemical and fertilizer industries, metallurgical and other industrial plants, and, finally, municipal incineration.

Indoor area sources include domestic cleaning activities, dry cleaners, printing shops, and petrol stations.

Mobile sources include automobiles, cars, railways, airways, and other types of vehicles.

Finally, natural sources include, as stated previously, physical disasters ( 33 ) such as forest fire, volcanic erosion, dust storms, and agricultural burning.

However, many classification systems have been proposed. Another type of classification is a grouping according to the recipient of the pollution, as follows:

Air pollution is determined as the presence of pollutants in the air in large quantities for long periods. Air pollutants are dispersed particles, hydrocarbons, CO, CO 2 , NO, NO 2 , SO 3 , etc.

Water pollution is organic and inorganic charge and biological charge ( 10 ) at high levels that affect the water quality ( 34 , 35 ).

Soil pollution occurs through the release of chemicals or the disposal of wastes, such as heavy metals, hydrocarbons, and pesticides.

Air pollution can influence the quality of soil and water bodies by polluting precipitation, falling into water and soil environments ( 34 , 36 ). Notably, the chemistry of the soil can be amended due to acid precipitation by affecting plants, cultures, and water quality ( 37 ). Moreover, movement of heavy metals is favored by soil acidity, and metals are so then moving into the watery environment. It is known that heavy metals such as aluminum are noxious to wildlife and fishes. Soil quality seems to be of importance, as soils with low calcium carbonate levels are at increased jeopardy from acid rain. Over and above rain, snow and particulate matter drip into watery ' bodies ( 36 , 38 ).

Lastly, pollution is classified following type of origin:

Radioactive and nuclear pollution , releasing radioactive and nuclear pollutants into water, air, and soil during nuclear explosions and accidents, from nuclear weapons, and through handling or disposal of radioactive sewage.

Radioactive materials can contaminate surface water bodies and, being noxious to the environment, plants, animals, and humans. It is known that several radioactive substances such as radium and uranium concentrate in the bones and can cause cancers ( 38 , 39 ).

Noise pollution is produced by machines, vehicles, traffic noises, and musical installations that are harmful to our hearing.

The World Health Organization introduced the term DALYs. The DALYs for a disease or health condition is defined as the sum of the Years of Life Lost (YLL) due to premature mortality in the population and the Years Lost due to Disability (YLD) for people living with the health condition or its consequences ( 39 ). In Europe, air pollution is the main cause of disability-adjusted life years lost (DALYs), followed by noise pollution. The potential relationships of noise and air pollution with health have been studied ( 40 ). The study found that DALYs related to noise were more important than those related to air pollution, as the effects of environmental noise on cardiovascular disease were independent of air pollution ( 40 ). Environmental noise should be counted as an independent public health risk ( 40 ).

Environmental pollution occurs when changes in the physical, chemical, or biological constituents of the environment (air masses, temperature, climate, etc.) are produced.

Pollutants harm our environment either by increasing levels above normal or by introducing harmful toxic substances. Primary pollutants are directly produced from the above sources, and secondary pollutants are emitted as by-products of the primary ones. Pollutants can be biodegradable or non-biodegradable and of natural origin or anthropogenic, as stated previously. Moreover, their origin can be a unique source (point-source) or dispersed sources.

Pollutants have differences in physical and chemical properties, explaining the discrepancy in their capacity for producing toxic effects. As an example, we state here that aerosol compounds ( 41 – 43 ) have a greater toxicity than gaseous compounds due to their tiny size (solid or liquid) in the atmosphere; they have a greater penetration capacity. Gaseous compounds are eliminated more easily by our respiratory system ( 41 ). These particles are able to damage lungs and can even enter the bloodstream ( 41 ), leading to the premature deaths of millions of people yearly. Moreover, the aerosol acidity ([H+]) seems to considerably enhance the production of secondary organic aerosols (SOA), but this last aspect is not supported by other scientific teams ( 38 ).

Climate and Pollution

Air pollution and climate change are closely related. Climate is the other side of the same coin that reduces the quality of our Earth ( 44 ). Pollutants such as black carbon, methane, tropospheric ozone, and aerosols affect the amount of incoming sunlight. As a result, the temperature of the Earth is increasing, resulting in the melting of ice, icebergs, and glaciers.

In this vein, climatic changes will affect the incidence and prevalence of both residual and imported infections in Europe. Climate and weather affect the duration, timing, and intensity of outbreaks strongly and change the map of infectious diseases in the globe ( 45 ). Mosquito-transmitted parasitic or viral diseases are extremely climate-sensitive, as warming firstly shortens the pathogen incubation period and secondly shifts the geographic map of the vector. Similarly, water-warming following climate changes leads to a high incidence of waterborne infections. Recently, in Europe, eradicated diseases seem to be emerging due to the migration of population, for example, cholera, poliomyelitis, tick-borne encephalitis, and malaria ( 46 ).

The spread of epidemics is associated with natural climate disasters and storms, which seem to occur more frequently nowadays ( 47 ). Malnutrition and disequilibration of the immune system are also associated with the emerging infections affecting public health ( 48 ).

The Chikungunya virus “took the airplane” from the Indian Ocean to Europe, as outbreaks of the disease were registered in Italy ( 49 ) as well as autochthonous cases in France ( 50 ).

An increase in cryptosporidiosis in the United Kingdom and in the Czech Republic seems to have occurred following flooding ( 36 , 51 ).

As stated previously, aerosols compounds are tiny in size and considerably affect the climate. They are able to dissipate sunlight (the albedo phenomenon) by dispersing a quarter of the sun's rays back to space and have cooled the global temperature over the last 30 years ( 52 ).

Air Pollutants

The World Health Organization (WHO) reports on six major air pollutants, namely particle pollution, ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. Air pollution can have a disastrous effect on all components of the environment, including groundwater, soil, and air. Additionally, it poses a serious threat to living organisms. In this vein, our interest is mainly to focus on these pollutants, as they are related to more extensive and severe problems in human health and environmental impact. Acid rain, global warming, the greenhouse effect, and climate changes have an important ecological impact on air pollution ( 53 ).

Particulate Matter (PM) and Health

Studies have shown a relationship between particulate matter (PM) and adverse health effects, focusing on either short-term (acute) or long-term (chronic) PM exposure.

Particulate matter (PM) is usually formed in the atmosphere as a result of chemical reactions between the different pollutants. The penetration of particles is closely dependent on their size ( 53 ). Particulate Matter (PM) was defined as a term for particles by the United States Environmental Protection Agency ( 54 ). Particulate matter (PM) pollution includes particles with diameters of 10 micrometers (μm) or smaller, called PM 10 , and extremely fine particles with diameters that are generally 2.5 micrometers (μm) and smaller.

Particulate matter contains tiny liquid or solid droplets that can be inhaled and cause serious health effects ( 55 ). Particles <10 μm in diameter (PM 10 ) after inhalation can invade the lungs and even reach the bloodstream. Fine particles, PM 2.5 , pose a greater risk to health ( 6 , 56 ) ( Table 1 ).

Table 1 . Penetrability according to particle size.

Multiple epidemiological studies have been performed on the health effects of PM. A positive relation was shown between both short-term and long-term exposures of PM 2.5 and acute nasopharyngitis ( 56 ). In addition, long-term exposure to PM for years was found to be related to cardiovascular diseases and infant mortality.

Those studies depend on PM 2.5 monitors and are restricted in terms of study area or city area due to a lack of spatially resolved daily PM 2.5 concentration data and, in this way, are not representative of the entire population. Following a recent epidemiological study by the Department of Environmental Health at Harvard School of Public Health (Boston, MA) ( 57 ), it was reported that, as PM 2.5 concentrations vary spatially, an exposure error (Berkson error) seems to be produced, and the relative magnitudes of the short- and long-term effects are not yet completely elucidated. The team developed a PM 2.5 exposure model based on remote sensing data for assessing short- and long-term human exposures ( 57 ). This model permits spatial resolution in short-term effects plus the assessment of long-term effects in the whole population.

Moreover, respiratory diseases and affection of the immune system are registered as long-term chronic effects ( 58 ). It is worth noting that people with asthma, pneumonia, diabetes, and respiratory and cardiovascular diseases are especially susceptible and vulnerable to the effects of PM. PM 2.5 , followed by PM 10 , are strongly associated with diverse respiratory system diseases ( 59 ), as their size permits them to pierce interior spaces ( 60 ). The particles produce toxic effects according to their chemical and physical properties. The components of PM 10 and PM 2.5 can be organic (polycyclic aromatic hydrocarbons, dioxins, benzene, 1-3 butadiene) or inorganic (carbon, chlorides, nitrates, sulfates, metals) in nature ( 55 ).

Particulate Matter (PM) is divided into four main categories according to type and size ( 61 ) ( Table 2 ).

Table 2 . Types and sizes of particulate Matter (PM).

Gas contaminants include PM in aerial masses.

Particulate contaminants include contaminants such as smog, soot, tobacco smoke, oil smoke, fly ash, and cement dust.

Biological Contaminants are microorganisms (bacteria, viruses, fungi, mold, and bacterial spores), cat allergens, house dust and allergens, and pollen.

Types of Dust include suspended atmospheric dust, settling dust, and heavy dust.

Finally, another fact is that the half-lives of PM 10 and PM 2.5 particles in the atmosphere is extended due to their tiny dimensions; this permits their long-lasting suspension in the atmosphere and even their transfer and spread to distant destinations where people and the environment may be exposed to the same magnitude of pollution ( 53 ). They are able to change the nutrient balance in watery ecosystems, damage forests and crops, and acidify water bodies.

As stated, PM 2.5 , due to their tiny size, are causing more serious health effects. These aforementioned fine particles are the main cause of the “haze” formation in different metropolitan areas ( 12 , 13 , 61 ).

Ozone Impact in the Atmosphere

Ozone (O 3 ) is a gas formed from oxygen under high voltage electric discharge ( 62 ). It is a strong oxidant, 52% stronger than chlorine. It arises in the stratosphere, but it could also arise following chain reactions of photochemical smog in the troposphere ( 63 ).

Ozone can travel to distant areas from its initial source, moving with air masses ( 64 ). It is surprising that ozone levels over cities are low in contrast to the increased amounts occuring in urban areas, which could become harmful for cultures, forests, and vegetation ( 65 ) as it is reducing carbon assimilation ( 66 ). Ozone reduces growth and yield ( 47 , 48 ) and affects the plant microflora due to its antimicrobial capacity ( 67 , 68 ). In this regard, ozone acts upon other natural ecosystems, with microflora ( 69 , 70 ) and animal species changing their species composition ( 71 ). Ozone increases DNA damage in epidermal keratinocytes and leads to impaired cellular function ( 72 ).

Ground-level ozone (GLO) is generated through a chemical reaction between oxides of nitrogen and VOCs emitted from natural sources and/or following anthropogenic activities.

Ozone uptake usually occurs by inhalation. Ozone affects the upper layers of the skin and the tear ducts ( 73 ). A study of short-term exposure of mice to high levels of ozone showed malondialdehyde formation in the upper skin (epidermis) but also depletion in vitamins C and E. It is likely that ozone levels are not interfering with the skin barrier function and integrity to predispose to skin disease ( 74 ).

Due to the low water-solubility of ozone, inhaled ozone has the capacity to penetrate deeply into the lungs ( 75 ).

Toxic effects induced by ozone are registered in urban areas all over the world, causing biochemical, morphologic, functional, and immunological disorders ( 76 ).

The European project (APHEA2) focuses on the acute effects of ambient ozone concentrations on mortality ( 77 ). Daily ozone concentrations compared to the daily number of deaths were reported from different European cities for a 3-year period. During the warm period of the year, an observed increase in ozone concentration was associated with an increase in the daily number of deaths (0.33%), in the number of respiratory deaths (1.13%), and in the number of cardiovascular deaths (0.45%). No effect was observed during wintertime.

Carbon Monoxide (CO)

Carbon monoxide is produced by fossil fuel when combustion is incomplete. The symptoms of poisoning due to inhaling carbon monoxide include headache, dizziness, weakness, nausea, vomiting, and, finally, loss of consciousness.

The affinity of carbon monoxide to hemoglobin is much greater than that of oxygen. In this vein, serious poisoning may occur in people exposed to high levels of carbon monoxide for a long period of time. Due to the loss of oxygen as a result of the competitive binding of carbon monoxide, hypoxia, ischemia, and cardiovascular disease are observed.

Carbon monoxide affects the greenhouses gases that are tightly connected to global warming and climate. This should lead to an increase in soil and water temperatures, and extreme weather conditions or storms may occur ( 68 ).

However, in laboratory and field experiments, it has been seen to produce increased plant growth ( 78 ).

Nitrogen Oxide (NO 2 )

Nitrogen oxide is a traffic-related pollutant, as it is emitted from automobile motor engines ( 79 , 80 ). It is an irritant of the respiratory system as it penetrates deep in the lung, inducing respiratory diseases, coughing, wheezing, dyspnea, bronchospasm, and even pulmonary edema when inhaled at high levels. It seems that concentrations over 0.2 ppm produce these adverse effects in humans, while concentrations higher than 2.0 ppm affect T-lymphocytes, particularly the CD8+ cells and NK cells that produce our immune response ( 81 ).It is reported that long-term exposure to high levels of nitrogen dioxide can be responsible for chronic lung disease. Long-term exposure to NO 2 can impair the sense of smell ( 81 ).

However, systems other than respiratory ones can be involved, as symptoms such as eye, throat, and nose irritation have been registered ( 81 ).

High levels of nitrogen dioxide are deleterious to crops and vegetation, as they have been observed to reduce crop yield and plant growth efficiency. Moreover, NO 2 can reduce visibility and discolor fabrics ( 81 ).

Sulfur Dioxide (SO 2 )

Sulfur dioxide is a harmful gas that is emitted mainly from fossil fuel consumption or industrial activities. The annual standard for SO 2 is 0.03 ppm ( 82 ). It affects human, animal, and plant life. Susceptible people as those with lung disease, old people, and children, who present a higher risk of damage. The major health problems associated with sulfur dioxide emissions in industrialized areas are respiratory irritation, bronchitis, mucus production, and bronchospasm, as it is a sensory irritant and penetrates deep into the lung converted into bisulfite and interacting with sensory receptors, causing bronchoconstriction. Moreover, skin redness, damage to the eyes (lacrimation and corneal opacity) and mucous membranes, and worsening of pre-existing cardiovascular disease have been observed ( 81 ).

Environmental adverse effects, such as acidification of soil and acid rain, seem to be associated with sulfur dioxide emissions ( 83 ).

Lead is a heavy metal used in different industrial plants and emitted from some petrol motor engines, batteries, radiators, waste incinerators, and waste waters ( 84 ).

Moreover, major sources of lead pollution in the air are metals, ore, and piston-engine aircraft. Lead poisoning is a threat to public health due to its deleterious effects upon humans, animals, and the environment, especially in the developing countries.

Exposure to lead can occur through inhalation, ingestion, and dermal absorption. Trans- placental transport of lead was also reported, as lead passes through the placenta unencumbered ( 85 ). The younger the fetus is, the more harmful the toxic effects. Lead toxicity affects the fetal nervous system; edema or swelling of the brain is observed ( 86 ). Lead, when inhaled, accumulates in the blood, soft tissue, liver, lung, bones, and cardiovascular, nervous, and reproductive systems. Moreover, loss of concentration and memory, as well as muscle and joint pain, were observed in adults ( 85 , 86 ).

Children and newborns ( 87 ) are extremely susceptible even to minimal doses of lead, as it is a neurotoxicant and causes learning disabilities, impairment of memory, hyperactivity, and even mental retardation.

Elevated amounts of lead in the environment are harmful to plants and crop growth. Neurological effects are observed in vertebrates and animals in association with high lead levels ( 88 ).

Polycyclic Aromatic Hydrocarbons(PAHs)

The distribution of PAHs is ubiquitous in the environment, as the atmosphere is the most important means of their dispersal. They are found in coal and in tar sediments. Moreover, they are generated through incomplete combustion of organic matter as in the cases of forest fires, incineration, and engines ( 89 ). PAH compounds, such as benzopyrene, acenaphthylene, anthracene, and fluoranthene are recognized as toxic, mutagenic, and carcinogenic substances. They are an important risk factor for lung cancer ( 89 ).

Volatile Organic Compounds(VOCs)

Volatile organic compounds (VOCs), such as toluene, benzene, ethylbenzene, and xylene ( 90 ), have been found to be associated with cancer in humans ( 91 ). The use of new products and materials has actually resulted in increased concentrations of VOCs. VOCs pollute indoor air ( 90 ) and may have adverse effects on human health ( 91 ). Short-term and long-term adverse effects on human health are observed. VOCs are responsible for indoor air smells. Short-term exposure is found to cause irritation of eyes, nose, throat, and mucosal membranes, while those of long duration exposure include toxic reactions ( 92 ). Predictable assessment of the toxic effects of complex VOC mixtures is difficult to estimate, as these pollutants can have synergic, antagonistic, or indifferent effects ( 91 , 93 ).

Dioxins originate from industrial processes but also come from natural processes, such as forest fires and volcanic eruptions. They accumulate in foods such as meat and dairy products, fish and shellfish, and especially in the fatty tissue of animals ( 94 ).

Short-period exhibition to high dioxin concentrations may result in dark spots and lesions on the skin ( 94 ). Long-term exposure to dioxins can cause developmental problems, impairment of the immune, endocrine and nervous systems, reproductive infertility, and cancer ( 94 ).

Without any doubt, fossil fuel consumption is responsible for a sizeable part of air contamination. This contamination may be anthropogenic, as in agricultural and industrial processes or transportation, while contamination from natural sources is also possible. Interestingly, it is of note that the air quality standards established through the European Air Quality Directive are somewhat looser than the WHO guidelines, which are stricter ( 95 ).

Effect of Air Pollution on Health

The most common air pollutants are ground-level ozone and Particulates Matter (PM). Air pollution is distinguished into two main types:

Outdoor pollution is the ambient air pollution.

Indoor pollution is the pollution generated by household combustion of fuels.

People exposed to high concentrations of air pollutants experience disease symptoms and states of greater and lesser seriousness. These effects are grouped into short- and long-term effects affecting health.

Susceptible populations that need to be aware of health protection measures include old people, children, and people with diabetes and predisposing heart or lung disease, especially asthma.

As extensively stated previously, according to a recent epidemiological study from Harvard School of Public Health, the relative magnitudes of the short- and long-term effects have not been completely clarified ( 57 ) due to the different epidemiological methodologies and to the exposure errors. New models are proposed for assessing short- and long-term human exposure data more successfully ( 57 ). Thus, in the present section, we report the more common short- and long-term health effects but also general concerns for both types of effects, as these effects are often dependent on environmental conditions, dose, and individual susceptibility.

Short-term effects are temporary and range from simple discomfort, such as irritation of the eyes, nose, skin, throat, wheezing, coughing and chest tightness, and breathing difficulties, to more serious states, such as asthma, pneumonia, bronchitis, and lung and heart problems. Short-term exposure to air pollution can also cause headaches, nausea, and dizziness.

These problems can be aggravated by extended long-term exposure to the pollutants, which is harmful to the neurological, reproductive, and respiratory systems and causes cancer and even, rarely, deaths.

The long-term effects are chronic, lasting for years or the whole life and can even lead to death. Furthermore, the toxicity of several air pollutants may also induce a variety of cancers in the long term ( 96 ).

As stated already, respiratory disorders are closely associated with the inhalation of air pollutants. These pollutants will invade through the airways and will accumulate at the cells. Damage to target cells should be related to the pollutant component involved and its source and dose. Health effects are also closely dependent on country, area, season, and time. An extended exposure duration to the pollutant should incline to long-term health effects in relation also to the above factors.

Particulate Matter (PMs), dust, benzene, and O 3 cause serious damage to the respiratory system ( 97 ). Moreover, there is a supplementary risk in case of existing respiratory disease such as asthma ( 98 ). Long-term effects are more frequent in people with a predisposing disease state. When the trachea is contaminated by pollutants, voice alterations may be remarked after acute exposure. Chronic obstructive pulmonary disease (COPD) may be induced following air pollution, increasing morbidity and mortality ( 99 ). Long-term effects from traffic, industrial air pollution, and combustion of fuels are the major factors for COPD risk ( 99 ).

Multiple cardiovascular effects have been observed after exposure to air pollutants ( 100 ). Changes occurred in blood cells after long-term exposure may affect cardiac functionality. Coronary arteriosclerosis was reported following long-term exposure to traffic emissions ( 101 ), while short-term exposure is related to hypertension, stroke, myocardial infracts, and heart insufficiency. Ventricle hypertrophy is reported to occur in humans after long-time exposure to nitrogen oxide (NO 2 ) ( 102 , 103 ).

Neurological effects have been observed in adults and children after extended-term exposure to air pollutants.

Psychological complications, autism, retinopathy, fetal growth, and low birth weight seem to be related to long-term air pollution ( 83 ). The etiologic agent of the neurodegenerative diseases (Alzheimer's and Parkinson's) is not yet known, although it is believed that extended exposure to air pollution seems to be a factor. Specifically, pesticides and metals are cited as etiological factors, together with diet. The mechanisms in the development of neurodegenerative disease include oxidative stress, protein aggregation, inflammation, and mitochondrial impairment in neurons ( 104 ) ( Figure 1 ).

Figure 1 . Impact of air pollutants on the brain.

Brain inflammation was observed in dogs living in a highly polluted area in Mexico for a long period ( 105 ). In human adults, markers of systemic inflammation (IL-6 and fibrinogen) were found to be increased as an immediate response to PNC on the IL-6 level, possibly leading to the production of acute-phase proteins ( 106 ). The progression of atherosclerosis and oxidative stress seem to be the mechanisms involved in the neurological disturbances caused by long-term air pollution. Inflammation comes secondary to the oxidative stress and seems to be involved in the impairment of developmental maturation, affecting multiple organs ( 105 , 107 ). Similarly, other factors seem to be involved in the developmental maturation, which define the vulnerability to long-term air pollution. These include birthweight, maternal smoking, genetic background and socioeconomic environment, as well as education level.

However, diet, starting from breast-feeding, is another determinant factor. Diet is the main source of antioxidants, which play a key role in our protection against air pollutants ( 108 ). Antioxidants are free radical scavengers and limit the interaction of free radicals in the brain ( 108 ). Similarly, genetic background may result in a differential susceptibility toward the oxidative stress pathway ( 60 ). For example, antioxidant supplementation with vitamins C and E appears to modulate the effect of ozone in asthmatic children homozygous for the GSTM1 null allele ( 61 ). Inflammatory cytokines released in the periphery (e.g., respiratory epithelia) upregulate the innate immune Toll-like receptor 2. Such activation and the subsequent events leading to neurodegeneration have recently been observed in lung lavage in mice exposed to ambient Los Angeles (CA, USA) particulate matter ( 61 ). In children, neurodevelopmental morbidities were observed after lead exposure. These children developed aggressive and delinquent behavior, reduced intelligence, learning difficulties, and hyperactivity ( 109 ). No level of lead exposure seems to be “safe,” and the scientific community has asked the Centers for Disease Control and Prevention (CDC) to reduce the current screening guideline of 10 μg/dl ( 109 ).

It is important to state that impact on the immune system, causing dysfunction and neuroinflammation ( 104 ), is related to poor air quality. Yet, increases in serum levels of immunoglobulins (IgA, IgM) and the complement component C3 are observed ( 106 ). Another issue is that antigen presentation is affected by air pollutants, as there is an upregulation of costimulatory molecules such as CD80 and CD86 on macrophages ( 110 ).

As is known, skin is our shield against ultraviolet radiation (UVR) and other pollutants, as it is the most exterior layer of our body. Traffic-related pollutants, such as PAHs, VOCs, oxides, and PM, may cause pigmented spots on our skin ( 111 ). On the one hand, as already stated, when pollutants penetrate through the skin or are inhaled, damage to the organs is observed, as some of these pollutants are mutagenic and carcinogenic, and, specifically, they affect the liver and lung. On the other hand, air pollutants (and those in the troposphere) reduce the adverse effects of ultraviolet radiation UVR in polluted urban areas ( 111 ). Air pollutants absorbed by the human skin may contribute to skin aging, psoriasis, acne, urticaria, eczema, and atopic dermatitis ( 111 ), usually caused by exposure to oxides and photochemical smoke ( 111 ). Exposure to PM and cigarette smoking act as skin-aging agents, causing spots, dyschromia, and wrinkles. Lastly, pollutants have been associated with skin cancer ( 111 ).

Higher morbidity is reported to fetuses and children when exposed to the above dangers. Impairment in fetal growth, low birth weight, and autism have been reported ( 112 ).

Another exterior organ that may be affected is the eye. Contamination usually comes from suspended pollutants and may result in asymptomatic eye outcomes, irritation ( 112 ), retinopathy, or dry eye syndrome ( 113 , 114 ).

Environmental Impact of Air Pollution

Air pollution is harming not only human health but also the environment ( 115 ) in which we live. The most important environmental effects are as follows.

Acid rain is wet (rain, fog, snow) or dry (particulates and gas) precipitation containing toxic amounts of nitric and sulfuric acids. They are able to acidify the water and soil environments, damage trees and plantations, and even damage buildings and outdoor sculptures, constructions, and statues.

Haze is produced when fine particles are dispersed in the air and reduce the transparency of the atmosphere. It is caused by gas emissions in the air coming from industrial facilities, power plants, automobiles, and trucks.

Ozone , as discussed previously, occurs both at ground level and in the upper level (stratosphere) of the Earth's atmosphere. Stratospheric ozone is protecting us from the Sun's harmful ultraviolet (UV) rays. In contrast, ground-level ozone is harmful to human health and is a pollutant. Unfortunately, stratospheric ozone is gradually damaged by ozone-depleting substances (i.e., chemicals, pesticides, and aerosols). If this protecting stratospheric ozone layer is thinned, then UV radiation can reach our Earth, with harmful effects for human life (skin cancer) ( 116 ) and crops ( 117 ). In plants, ozone penetrates through the stomata, inducing them to close, which blocks CO 2 transfer and induces a reduction in photosynthesis ( 118 ).

Global climate change is an important issue that concerns mankind. As is known, the “greenhouse effect” keeps the Earth's temperature stable. Unhappily, anthropogenic activities have destroyed this protecting temperature effect by producing large amounts of greenhouse gases, and global warming is mounting, with harmful effects on human health, animals, forests, wildlife, agriculture, and the water environment. A report states that global warming is adding to the health risks of poor people ( 119 ).

People living in poorly constructed buildings in warm-climate countries are at high risk for heat-related health problems as temperatures mount ( 119 ).

Wildlife is burdened by toxic pollutants coming from the air, soil, or the water ecosystem and, in this way, animals can develop health problems when exposed to high levels of pollutants. Reproductive failure and birth effects have been reported.

Eutrophication is occurring when elevated concentrations of nutrients (especially nitrogen) stimulate the blooming of aquatic algae, which can cause a disequilibration in the diversity of fish and their deaths.

Without a doubt, there is a critical concentration of pollution that an ecosystem can tolerate without being destroyed, which is associated with the ecosystem's capacity to neutralize acidity. The Canada Acid Rain Program established this load at 20 kg/ha/yr ( 120 ).

Hence, air pollution has deleterious effects on both soil and water ( 121 ). Concerning PM as an air pollutant, its impact on crop yield and food productivity has been reported. Its impact on watery bodies is associated with the survival of living organisms and fishes and their productivity potential ( 121 ).

An impairment in photosynthetic rhythm and metabolism is observed in plants exposed to the effects of ozone ( 121 ).

Sulfur and nitrogen oxides are involved in the formation of acid rain and are harmful to plants and marine organisms.

Last but not least, as mentioned above, the toxicity associated with lead and other metals is the main threat to our ecosystems (air, water, and soil) and living creatures ( 121 ).

In 2018, during the first WHO Global Conference on Air Pollution and Health, the WHO's General Director, Dr. Tedros Adhanom Ghebreyesus, called air pollution a “silent public health emergency” and “the new tobacco” ( 122 ).

Undoubtedly, children are particularly vulnerable to air pollution, especially during their development. Air pollution has adverse effects on our lives in many different respects.

Diseases associated with air pollution have not only an important economic impact but also a societal impact due to absences from productive work and school.

Despite the difficulty of eradicating the problem of anthropogenic environmental pollution, a successful solution could be envisaged as a tight collaboration of authorities, bodies, and doctors to regularize the situation. Governments should spread sufficient information and educate people and should involve professionals in these issues so as to control the emergence of the problem successfully.

Technologies to reduce air pollution at the source must be established and should be used in all industries and power plants. The Kyoto Protocol of 1997 set as a major target the reduction of GHG emissions to below 5% by 2012 ( 123 ). This was followed by the Copenhagen summit, 2009 ( 124 ), and then the Durban summit of 2011 ( 125 ), where it was decided to keep to the same line of action. The Kyoto protocol and the subsequent ones were ratified by many countries. Among the pioneers who adopted this important protocol for the world's environmental and climate “health” was China ( 3 ). As is known, China is a fast-developing economy and its GDP (Gross Domestic Product) is expected to be very high by 2050, which is defined as the year of dissolution of the protocol for the decrease in gas emissions.

A more recent international agreement of crucial importance for climate change is the Paris Agreement of 2015, issued by the UNFCCC (United Nations Climate Change Committee). This latest agreement was ratified by a plethora of UN (United Nations) countries as well as the countries of the European Union ( 126 ). In this vein, parties should promote actions and measures to enhance numerous aspects around the subject. Boosting education, training, public awareness, and public participation are some of the relevant actions for maximizing the opportunities to achieve the targets and goals on the crucial matter of climate change and environmental pollution ( 126 ). Without any doubt, technological improvements makes our world easier and it seems difficult to reduce the harmful impact caused by gas emissions, we could limit its use by seeking reliable approaches.

Synopsizing, a global prevention policy should be designed in order to combat anthropogenic air pollution as a complement to the correct handling of the adverse health effects associated with air pollution. Sustainable development practices should be applied, together with information coming from research in order to handle the problem effectively.

At this point, international cooperation in terms of research, development, administration policy, monitoring, and politics is vital for effective pollution control. Legislation concerning air pollution must be aligned and updated, and policy makers should propose the design of a powerful tool of environmental and health protection. As a result, the main proposal of this essay is that we should focus on fostering local structures to promote experience and practice and extrapolate these to the international level through developing effective policies for sustainable management of ecosystems.

Author Contributions

All authors listed have made a substantial, direct and intellectual contribution to the work, and approved it for publication.

Conflict of Interest

IM is employed by the company Delphis S.A.

The remaining authors declare that the present review paper was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Keywords: air pollution, environment, health, public health, gas emission, policy

Citation: Manisalidis I, Stavropoulou E, Stavropoulos A and Bezirtzoglou E (2020) Environmental and Health Impacts of Air Pollution: A Review. Front. Public Health 8:14. doi: 10.3389/fpubh.2020.00014

Received: 17 October 2019; Accepted: 17 January 2020; Published: 20 February 2020.

Reviewed by:

Copyright © 2020 Manisalidis, Stavropoulou, Stavropoulos and Bezirtzoglou. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Ioannis Manisalidis, giannismanisal@gmail.com ; Elisavet Stavropoulou, elisabeth.stavropoulou@gmail.com

† These authors have contributed equally to this work

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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Environmental Sustainability Impacts of Solid Waste Management Practices in the Global South

Ismaila rimi abubakar.

1 College of Architecture and Planning, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia

Khandoker M. Maniruzzaman

2 Department of Urban and Regional Planning, College of Architecture and Planning, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia

Umar Lawal Dano

Faez s. alshihri, maher s. alshammari, sayed mohammed s. ahmed, wadee ahmed ghanem al-gehlani.

3 Department of Architecture, College of Architecture and Planning, Imam Abdulrahman Bin Faisal University, Dammam 32141, Saudi Arabia

Tareq I. Alrawaf

4 Department of Landscape Architecture, College of Architecture and Planning, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia

Associated Data

No data were reported in this review article.

Solid waste management (SWM) is one of the key responsibilities of city administrators and one of the effective proxies for good governance. Effective SWM mitigates adverse health and environmental impacts, conserves resources, and improves the livability of cities. However, unsustainable SWM practices, exacerbated by rapid urbanization and financial and institutional limitations, negatively impact public health and environmental sustainability. This review article assesses the human and environmental health impacts of SWM practices in the Global South cities that are the future of global urbanization. The study employs desktop research methodology based on in-depth analysis of secondary data and literature, including official documents and published articles. It finds that the commonplace SWM practices include mixing household and commercial garbage with hazardous waste during storage and handling. While waste storage is largely in old or poorly managed facilities such as storage containers, the transportation system is often deficient and informal. The disposal methods are predominantly via uncontrolled dumping, open-air incinerators, and landfills. The negative impacts of such practices include air and water pollution, land degradation, emissions of methane and hazardous leachate, and climate change. These impacts impose significant environmental and public health costs on residents with marginalized social groups mostly affected. The paper concludes with recommendations for mitigating the public and environmental health risks associated with the existing SWM practices in the Global South.

1. Introduction

Solid waste management (SWM) continues to dominate as a major societal and governance challenge, especially in urban areas overwhelmed by the high rate of population growth and garbage generation. The role of SWM in achieving sustainable development is emphasized in several international development agendas, charters, and visions. For example, sustainable SWM can help meet several United Nations’ Sustainable Development Goals (SDG), such as ensuring clean water and sanitation (SDG6), creating sustainable cities and inclusive communities (SDG11), mitigating climate change (SDG13), protecting life on land (SDG15), and demonstrating sustainable consumption and production patterns (SDG12) ( https://sdgs.un.org/goals , accessed on 26 September 2022). It also fosters a circular urban economy that promotes reductions in the consumption of finite resources, materials reuse and recycling for waste elimination, pollution reduction, cost saving, and green growth

However, coupled with economic growth, improved lifestyle, and consumerism, cities across the globe will continue to face an overwhelming challenge of SWM as the world population is expected to rise to 8 billion by 2025 and to 9.3 billion by 2050, out of which around 70% will be living in urban areas [ 1 , 2 ]. In developing countries, most cities collect only 50–80% of generated waste after spending 20–50% of their budgets, of which 80–95% are spent on collecting and transporting waste [ 3 , 4 ]. Moreover, many low-income countries collect as low as 10% of the garbage generated in suburban areas, which contributes to public health and environmental risks, including higher incidents of diarrhea and acute respiratory infections among people, particularly children, living near garbage dumps [ 5 ]. Obstacles to effective municipal SWM include lack of awareness, technologies, finances, and good governance [ 6 , 7 , 8 ].

Removing garbage from homes and businesses without greater attention to what was then carried out with it has also been the priority of municipal SWM in several cities of developing countries [ 9 ]. In most developing countries, garbage collected from households is disposed of in landfills or dumpsites, the majority of which are projected to reach their capacities within a decade. The unsustainable approach of dumping or burning waste in an open space, usually near poor communities on the city edge, or throwing garbage into water bodies was an acceptable garbage disposal strategy. Similarly, several cities still use old-generation or poorly managed facilities and informal uncontrolled dumping or open-air waste burning. Often, these practices affect marginalized social groups near the disposal sites [ 10 ]. Moreover, this approach poses several sustainability problems, including resource depletion, environmental pollution, and public health problems, such as the spread of communicable diseases.

However, ever since the advent of the environmental movement in the 1960s, there has been a far-reaching appreciation of environmental and public health risks of unsustainable SWM practices. In the 1970s and onward, SWM was a technical issue to be resolved using technology; hence, the emphasis and investments were placed on garbage collection equipment [ 5 ]. Although modern technology can significantly reduce emissions of hazardous substances, by the 1990s, that viewpoint changed when municipalities become unable to evacuate and dispose of garbage effectively without the active involvement of service users and other stakeholders [ 5 ]. The inability of the public sector in the global South to deliver sufficient improvement of SWM, coupled with the pressure from the financial institutions and other donor agencies, led to privatization policies at the end of the decade. However, as privatization failed to provide municipal SWM services to the poor and marginalized communities, the current global thinking on addressing municipal SWM problems is changing.

A more sustainable waste management approach prioritizes practices such as reduced production, waste classifications, reuse, recycling, and energy recovery over the common practices of landfilling, open dumps, and open incineration [ 11 , 12 , 13 ]. This approach, which is still at an early stage but getting increased attention in the Global South, is more inclusive and environment-friendly and has less negative impact on human health and the environment than the common practices [ 14 , 15 , 16 ]. As such, there is a need to assess SWM practices in the Global South and their impacts on environmental and human health because 90% of the expected growth in the urban population by 2050 is expected to happen here. So far, there are a few studies on the impacts of SWM practices on human health and the environment in the global regions.

Therefore, this review article addresses this knowledge gap by assessing the negative impacts of the dominant SWM practices on human and environmental health. Section 2 presents the research methodology. Section 3 reviews the major SWM practices in the Global South and assesses the environmental and public health implications of SWM practices in the Global South cities. While Section 4 discusses the implications of the findings and proffers recommendations that could help authorities to deal with SWM challenges and mitigate public and environmental health risks associated with unsustainable SWM practices, Section 5 concludes the paper.

2. Materials and Methods

The present paper utilizes a desktop research method of collecting and analyzing relevant data from the existing literature, as utilized in some previous studies [ 17 , 18 ]. The method consists of three iterative stages shown in Figure 1 : (a) scoping, (b) collecting relevant literature, and (c) data analysis. Firstly, the scoping stage involves defining and understanding the research problem under investigation and setting the study scope and boundary. The scope of the paper is to explore human and environmental impacts of SWM practices toward policy and practical recommendations for a more sustainable SWM system, with the Global South as the study boundary. This stage also helped identify relevant keywords to search for during the literature review in the second stage.

The flow chart of the research method (Source: [ 18 ] (p. 4)).

The second stage involved identifying and collecting relevant literature from online sources. The researchers utilized Google Scholar and Scopus databases to identify peer-reviewed academic works (peer-reviewed articles, conference proceedings, and books) as well as the gray literature. The literature that satisfied the following three inclusion criteria was identified and downloaded: (1) It is related to the study’s objective; (2) it is in the English language; and (3) it was published within the last twenty years, although some old documents about established concepts and approaches were also accessed. The downloaded gray literature includes newspaper articles, statistics, technical reports, and website contents from international development organizations such as the World Health Organization (WHO), the United Nations, and the World Bank.

In the last stage, the authors organized, analyzed, and synthesized the data collected from the literature. The downloaded works were organized according to the similarity of topics, even though some fit in more than one category. Then, each document was thoroughly examined, and themes concerned with SWM practices and their human and environmental impacts were collated, synthesized, and harmonized. Finally, the themes were summarized in Table A1 , Table A2 and Table A3 (see Appendix A ) and discussed. Implications and recommendations of the findings are then highlighted.

3. Results and Discussion

3.1. solid waste management practices in the global south.

Global municipal solid waste (MSW) generation rose from 1.3 billion tons in 2012 to 2.1 billion tons (0.74 kg/capita/day) as of 2016, which by 2050 is expected to increase by 70% to reach a total of 3.40 billion tons or 1.42 kg/capita/day [ 19 ]. The per capita MSW generation varies among regions and countries. In the EU (European Union), it ranges from 0.3–1.4 kg/capita/day [ 20 ], and in some African cities, the average is 0.78 kg/capita/day [ 21 ]. In Asia, urban areas generate about 760,000 tons of MSW per day, which is expected to increase to 1.8 million tons per day or 26% of the world’s total by 2025, despite the continent housing 53% of the world’s population [ 22 , 23 ]. In China, the total MSW generation was around 212 million tons (0.98 kg/capita/day) in 2006, out of which 91.4%, 6.4%, and 2.2% were disposed of via landfilling, incineration, and composting [ 24 ]. In 2010, only 660 Chinese cities produced about 190 million tons of MSW, accounting for 29% of the world’s total, while the total amount of solid waste in China could reach at least 480 million tons in 2030 [ 25 ]. In China, industrial waste (more than one billion tons) was five times the amount of MSW generated in 2002, which is expected to generate approximately twice as much MSW as the USA, while India will overtake the USA in MSW generation by 2030 [ 26 ].

In Malaysia, while the average rate of MSW generation was about 0.5–0.8 kg/person/day, Kuala Lumpur’s daily per capita generation rate was 1.62 kg in 2008 [ 27 ], which is expected to reach 2.23 kg in 2024 [ 28 ]. About 64% of Malaysia’s waste consists of household and office waste, 25% industrial waste, 8% commercial waste, and 3% construction waste [ 29 ]. In Sri Lanka, the assessed mean waste generation in 1999 was 6500 tons/day or 0.89 kg/cap/day, which is estimated to reach 1.0 kg/cap/day by 2025 [ 30 ]. With a 1.2% population growth rate, the total MSW generation in 2009 was approximately 7250 tons/day [ 31 ]. In Ghana, the solid waste generation rate was 0.47 kg/person/day, or about 12,710 tons per annum, consisting of biodegradable waste (0.318), non-biodegradable (0.096), and inert and miscellaneous waste (0.055) kg/person/day, respectively [ 32 ].

Moreover, global SWM costs are anticipated to increase to about $375.5 billion in 2025, with more than four-fold increases in lower- to middle-income countries and five-fold increases in low-income countries [ 33 ]. Globally, garbage collection, transportation, and disposal pose a major cost component in SWM systems [ 19 ]. Inadequate funding militates against the optimization of MSW disposal services. Table 1 compares the everyday SWM practices in low-, middle- and high-income countries according to major waste management steps. The literature indicates that waste generation rates and practices depend on the culture, socioeconomic status, population density, and level of commercial and industrial activities of a city or region.

Common MSW management practices by country’s level of economic development (adapted from [ 34 ]).

3.2. Environmental and Public Health Impacts of SWM Practices in the Global South

• (a)  Weak and Inadequate SWM System

Many problems in the cities of the global South are often associated with a weak or inadequate SWM system, which leads to severe direct and indirect environmental and public health issues at every stage of waste collection, handling, treatment, and disposal [ 30 , 31 , 32 , 33 , 34 ]. Inadequate and weak SWM results in indiscriminate dumping of waste on the streets, open spaces, and water bodies. Such practices were observed in, for example, Pakistan [ 35 , 36 ], India [ 37 ], Nepal [ 38 ], Peru [ 39 ], Guatemala [ 40 ], Brazil [ 41 ], Kenya [ 42 ], Rwanda [ 43 ], South Africa [ 44 , 45 ], Nigeria [ 46 ], Zimbabwe [ 47 ], etc.

The problems associated with such practices are GHG emissions [ 37 , 48 ], leachates [ 40 , 44 , 49 ], the spread of diseases such as malaria and dengue [ 36 ], odor [ 35 , 38 , 50 , 51 ], blocking of drains and sewers and subsequent flooding [ 52 ], suffocation of animals in plastic bags [ 52 ], and indiscriminate littering [ 38 , 39 , 53 ].

• (b)  Irregular Waste Collection and Handling

Uncollected and untreated waste has socioeconomic and environmental costs extending beyond city boundaries. Environmental sustainability impacts of this practice include methane (CH 4 ) emissions, foul odor, air pollution, land and water contamination, and the breeding of rodents, insects, and flies that transmit diseases to humans. Decomposition of biodegradable waste under anaerobic conditions contributes to about 18% and 2.9% of global methane and GHG emissions, respectively [ 54 ], with the global warming effect of about 25 times higher than carbon dioxide (CO 2 ) emissions [ 55 ]. Methane also causes fires and explosions [ 56 ]. Emissions from SWM in developing countries are increasing due to rapid economic growth and improved living standards [ 57 ].

Irregular waste collection also contributes to marine pollution. In 2010, 192 coastal countries generated 275 million metric tons of plastic waste out of which up to 12.7 million metric tons (4.4%) entered ocean ecosystems [ 58 ]. Moreover, plastic waste collects and stagnates water, proving a mosquito breeding habitat and raising the risks of dengue, malaria, and West Nile fever [ 56 ]. In addition, uncollected waste creates serious safety, health, and environmental consequences such as promoting urban violence and supporting breeding and feeding grounds for flies, mosquitoes, rodents, dogs, and cats, which carry diseases to nearby homesteads [ 4 , 19 , 59 , 60 ].

In the global South, scavengers often throw the remaining unwanted garbage on the street. Waste collectors are rarely protected from direct contact and injury, thereby facing serious health threats. Because garbage trucks are often derelict and uncovered, exhaust fumes and dust stemming from waste collection and transportation contribute to environmental pollution and widespread health problems [ 61 ]. In India’s megacities, for example, irregular MSW management is one of the major problems affecting air and marine quality [ 62 ]. Thus, irregular waste collection and handling contribute to public health hazards and environmental degradation [ 63 ].

• (c)  Landfilling and Open Dumping

Most municipal solid waste in the Global South goes into unsanitary landfills or open dumps. Even during the economic downturn during the COVID-19 pandemic, the amount of waste heading to landfill sites in Brazil, for example, increased due to lower recycling rates [ 64 ]. In Johor, Malaysia, landfilling destroys natural habitats and depletes the flora and fauna [ 65 ]. Moreover, landfilling with untreated, unsorted waste led to severe public health issues in South America [ 66 ]. Based on a study on 30 Brazilian cities, Urban and Nakada [ 64 ] report that 35% of medical waste was not properly treated before disposal, which poses a threat to public health, including the spread of COVID-19. Landfills and open dumps are also associated with high emissions of methane (CH 4 ), a major GHG [ 67 , 68 ]. Landfills and wastewater release 17% of the global methane emission [ 25 ]. About 29 metric tons of methane are emitted annually from landfills globally, accounting for about 8% of estimated global emissions, with 1.3 metric tons released from landfills in Africa [ 7 ]. The rate of landfill gas production steadily rises while MSW accumulates in the landfill emissions. Released methane and ammonia gases can cause health hazards such as respiratory diseases [ 37 , 69 , 70 , 71 ]. Since methane is highly combustible, it can cause fire and explosion hazards [ 72 ].

Open dumping sites with organic waste create the environment for the breeding of disease-carrying vectors, including rodents, flies, and mosquitoes [ 40 , 45 , 51 , 73 , 74 , 75 , 76 , 77 , 78 , 79 ]. Associated vector-borne diseases include zika virus, dengue, and malaria fever [ 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 ]. In addition, there are risks of water-borne illnesses such as leptospirosis, intestinal worms, diarrhea, and hepatitis A [ 80 , 81 ].

Odors from landfill sites, and their physical appearance, affect the lives of nearby residents by threatening their health and undermining their livelihoods, lowering their property values [ 37 , 38 , 68 , 82 , 83 , 84 ]. Moreover, the emission of ammonia (NH 3 ) from landfill sites can damage species’ composition and plant leaves [ 85 ]. In addition, the pollutants from landfill sites damage soil quality [ 73 , 84 ]. Landfill sites also generate dust and are sources of noise pollution [ 86 ].

Air and water pollution are intense in the hot and rainy seasons due to the emission of offensive odor, disease-carrying leachates, and runoff. Considerable amounts of methane and CO 2 from landfill sites produce adverse health effects such as skin, eyes, nose, and respiratory diseases [ 69 , 87 , 88 ]. The emission of ammonia can lead to similar problems and even blindness [ 85 , 89 ]. Other toxic gaseous pollutants from landfill sites include Sulphur oxides [ 89 ]. While less than 20% of methane is recovered from landfills in China, Western nations recover up to 60% [ 90 ].

Several studies report leachate from landfill sites contaminating water sources used for drinking and other household applications, which pose significant risks to public health [ 36 , 43 , 53 , 72 , 75 , 83 , 91 , 92 , 93 , 94 , 95 ]. For example, Hong et al. [ 95 ] estimated that, in 2006, the amount of leachates escaping from landfill sites in Pudong (China) was 160–180 m 3 per day. On the other hand, a properly engineered facility for waste disposal can protect public health, preserve important environmental resources, prevent clogging of drainages, and prevent the migration of leachates to contaminate ground and surface water, farmlands, animals, and air from which they enter the human body [ 61 , 96 ]. Moreover, heat in summer can speed up the rate of bacterial action on biodegradable organic material and produce a pungent odor [ 60 , 97 , 98 ]. In China, for example, leachates were not treated in 47% of landfills [ 99 ].

Co-mingled disposal of industrial and medical waste alongside municipal waste endangers people with chemical and radioactive hazards, Hepatitis B and C, tetanus, human immune deficiency, HIV infections, and other related diseases [ 59 , 60 , 100 ]. Moreover, indiscriminate disposal of solid waste can cause infectious diseases such as gastrointestinal, dermatological, respiratory, and genetic diseases, chest pains, diarrhea, cholera, psychological disorders, skin, eyes, and nose irritations, and allergies [ 10 , 36 , 60 , 61 ].

• (d)  Open Burning and Incineration

Open burning of MSW is a main cause of smog and respiratory diseases, including nose, throat, chest infections and inflammation, breathing difficulty, anemia, low immunity, allergies, and asthma. Similar health effects were reported from Nepal [ 101 ], India [ 87 ], Mexico, [ 69 ], Pakistan [ 52 , 73 , 84 ], Indonesia [ 88 ], Liberia [ 50 ], and Chile [ 102 ]. In Mumbai, for example, open incineration emits about 22,000 tons of pollutants annually [ 56 ]. Mongkolchaiarunya [ 103 ] reported air pollution and odors from burning waste in Thailand. In addition, plastic waste incineration produces hydrochloric acid and dioxins in quantities that are detrimental to human health and may cause allergies, hemoglobin deficiency, and cancer [ 95 , 104 ]. In addition, smoke from open incineration and dumpsites is a significant contributor to air pollution even for persons staying far from dumpsites.

• (e)  Composting

Composting is a biological method of waste disposal that entails the decomposing or breaking down of organic wastes into simpler forms by naturally occurring microorganisms, such as bacteria and fungi. However, despite its advantage of reducing organic waste by at least half and using compost in agriculture, the composting method has much higher CO 2 emissions than other disposal approaches. In Korea, for example, composting has the highest environmental impact than incineration and anaerobic digestion methods [ 105 ]. The authors found that the environmental impact of composting was found to be 2.4 times higher than that of incineration [ 105 ]. Some reviews linked composting with several health issues, including congested nose, sore throat and dry cough, bronchial asthma, allergic rhinitis, and extrinsic allergic alveolitis [ 36 , 106 ].

4. Implications and Recommendations

As discussed in the section above, there are many negative impacts of unsustainable SWM practices on the people and the environment. Although all waste treatment methods have their respective negative impacts, some have fewer debilitating impacts on people and the environment than others. The following is the summary of key implications of such unsustainable SWM practices.

• Uncollected organic waste from bins, containers and open dumps harbors rodents, insects, and reptiles that transmit diseases to humans. It also produces odor due to the decomposition of organic wastes, especially in the summer, and leachates that migrate and contaminate receiving underground and surface waters.
• Open dumps and non-engineered landfills release methane from decomposing biodegradable waste under anaerobiotic conditions. Methane is a key contributor to global warming, and it can cause fires and explosions.
• Non-biodegradable waste, such as discarded tires, plastics, bottles, and tins, pollutes the ground and collects water, thus creating breeding grounds for mosquitoes and increasing the risk of diseases such as malaria, dengue, and West Nile fever.
• Open burning of MSW emits pollutants into the atmosphere thereby increasing the incidences of nose and throat infections and inflammation, inhalation difficulties, bacterial infections, anemia, reduced immunity, allergies, and asthma.
• Uncontrolled incineration causes smog and releases fine particles, which are a major cause of respiratory disease. It also contributes to urban air pollution and GHG emissions significantly.
• Incineration and landfilling are associated with reproductive defects in women, developmental defects in children, cancer, hepatitis C, psychosocial impacts, poisoning, biomarkers, injuries, and mortality.

Therefore, measures toward more sustainable SWM that can mitigate such impacts must be worked out and followed. The growing complexity, costs, and coordination of SWM require multi-stakeholder involvement at each process stage [ 7 ]. Earmarking resources, providing technical assistance, good governance, and collaboration, and protecting environmental and human health are SWM critical success factors [ 47 , 79 ]. As such, local governments, the private sector, donor agencies, non-governmental organizations (NGOs), the residents, and informal garbage collectors and scavengers have their respective roles to play collaboratively in effective and sustainable SWM [ 40 , 103 , 107 , 108 ]. The following are key practical recommendations for mitigating the negative impacts of unsustainable SWM practices enumerated above.

First, cities should plan and implement an integrated SWM approach that emphasizes improving the operation of municipalities to manage all stages of SWM sustainably: generation, separation, transportation, transfer/sorting, treatment, and disposal [ 36 , 46 , 71 , 77 , 86 ]. The success of this approach requires the involvement of all stakeholders listed above [ 109 ] while recognizing the environmental, financial, legal, institutional, and technical aspects appropriate to each local setting [ 77 , 86 ]. Life Cycle Assessment (LCA) can likewise aid in selecting the method and preparing the waste management plan [ 88 , 110 ]. Thus, the SWM approach should be carefully selected to spare residents from negative health and environmental impacts [ 36 , 39 , 83 , 98 , 111 ].

Second, local governments should strictly enforce environmental regulations and better monitor civic responsibilities for sustainable waste storage, collection, and disposal, as well as health hazards of poor SWM, reflected in garbage littering observable throughout most cities of the Global South [ 64 , 84 ]. In addition, violations of waste regulations should be punished to discourage unsustainable behaviors [ 112 ]. Moreover, local governments must ensure that waste collection services have adequate geographical coverage, including poor and minority communities [ 113 ]. Local governments should also devise better SWM policies focusing on waste reduction, reuse, and recycling to achieve a circular economy and sustainable development [ 114 , 115 ].

Third, effective SWM requires promoting positive public attitudes toward sustainable waste management [ 97 , 116 , 117 , 118 ]. Therefore, public awareness campaigns through print, electronic, and social media are required to encourage people to desist from littering and follow proper waste dropping and sorting practices [ 36 , 64 , 77 , 79 , 80 , 82 , 91 , 92 , 119 ]. There is also the need for a particular focus on providing sorting bins and public awareness about waste sorting at the source, which can streamline and optimize subsequent SWM processes and mitigate their negative impacts [ 35 , 45 , 46 , 64 , 69 , 89 , 93 ]. Similarly, non-governmental and community-based organizations can help promote waste reduction, separation, and sorting at the source, and material reuse/recycling [ 103 , 120 , 121 , 122 ]. In Vietnam, for example, Tsai et al. [ 123 ] found that coordination among stakeholders and appropriate legal and policy frameworks are crucial in achieving sustainable SWM.

Fourth, there is the need to use environmentally friendly technologies or upgrade existing facilities. Some researchers prefer incineration over other methods, particularly for non-recyclable waste [ 44 , 65 ]. For example, Xin et al. [ 124 ] found that incineration, recycling, and composting resulted in a 70.82% reduction in GHG emissions from solid waste in Beijing. In Tehran city, Iran, Maghmoumi et al. [ 125 ] revealed that the best scenario for reducing GHG emissions is incinerating 50% of the waste, landfilling 30%, and recycling 20%. For organic waste, several studies indicate a preference for composting [ 45 , 51 , 75 ] and biogas generation [ 15 , 42 , 68 ]. Although some researchers have advocated a complete ban on landfilling [ 13 , 42 ], it should be controlled with improved techniques for leak detection and leachate and biogas collection [ 126 , 127 ]. Many researchers also suggested an integrated biological and mechanical treatment (BMT) of solid waste [ 66 , 74 , 95 , 119 ]. In Kenya, the waste-to-biogas scheme and ban on landfill and open burning initiatives are estimated to reduce the emissions of over 1.1 million tons of GHG and PM2.5 emissions from the waste by more than 30% by 2035 [ 42 ]. An appropriately designed waste disposal facility helps protect vital environmental resources, including flora, fauna, surface and underground water, air, and soil [ 128 , 129 ].

Fifth, extraction and reuse of materials, energy, and nutrients are essential to effective SWM, which provides livelihoods for many people, improves their health, and protects the environment [ 130 , 131 , 132 , 133 , 134 , 135 , 136 ]. For example, recycling 24% of MSW in Thailand lessened negative health, social, environmental, and economic impacts from landfill sites [ 89 ]. Waste pickers play a key role in waste circularity and should be integrated into the SWM system [ 65 , 89 , 101 , 137 ], even to the extent of taking part in decision-making [ 138 ]. In addition, workers involved in waste collection should be better trained and equipped to handle hazardous waste [ 87 , 128 ]. Moreover, green consumption, using bioplastics, can help reduce the negative impacts of solid waste on the environment [ 139 ].

Lastly, for effective SWM, local authorities should comprehensively address SWM challenges, such as lack of strategic SWM plans, inefficient waste collection/segregation and recycling, insufficient budgets, shortage of qualified waste management professionals, and weak governance, and then form a financial regulatory framework in an integrated manner [ 140 , 141 , 142 ]. Effective SWM system also depends on other factors such as the waste generation rate, population density, economic status, level of commercial activity, culture, and city/region [ 37 , 143 ]. A sustainable SWM strives to protect public health and the environment [ 144 , 145 ].

5. Conclusions

As global solid waste generation rates increase faster than urbanization, coupled with inadequate SWM systems, local governments and urban residents often resort to unsustainable SWM practices. These practices include mixing household and commercial garbage with hazardous waste during storage and handling, storing garbage in old or poorly managed facilities, deficient transportation practices, open-air incinerators, informal/uncontrolled dumping, and non-engineered landfills. The implications of such practices include air and water pollution, land degradation, climate change, and methane and hazardous leachate emissions. In addition, these impacts impose significant environmental and public health costs on residents with marginalized social groups affected mostly.

Inadequate SWM is associated with poor public health, and it is one of the major problems affecting environmental quality and cities’ sustainable development. Effective community involvement in the SWM requires promoting positive public attitudes. Public awareness campaigns through print, electronic, and social media are required to encourage people to desist from littering and follow proper waste-dropping practices. Improper SWM also resulted in water pollution and unhealthy air in cities. Future research is needed to investigate how the peculiarity of each Global South country can influence selecting the SWM approach, elements, aspects, technology, and legal/institutional frameworks appropriate to each locality.

Reviewed literature on the impacts of SWM practices in Asia (compiled by authors).

Reviewed literature on the impacts of SWM practices in South America (compiled by authors).

Reviewed literature on the impacts of SWM practices in Africa (compiled by authors).

Funding Statement

This research received no external funding.

Author Contributions

Conceptualization, I.R.A. and K.M.M.; methodology, I.R.A., K.M.M. and U.L.D.; validation, I.R.A., K.M.M. and U.L.D.; formal analysis, I.R.A. and K.M.M.; investigation, I.R.A., K.M.M., U.L.D., F.S.A., M.S.A., S.M.S.A. and W.A.G.A.-G.; resources, I.R.A., K.M.M., U.L.D., F.S.A., M.S.A., S.M.S.A., W.A.G.A.-G. and T.I.A.; data curation, U.L.D., F.S.A., M.S.A., S.M.S.A. and W.A.G.A.-G.; writing—original draft preparation, I.R.A., K.M.M., U.L.D., F.S.A., M.S.A., S.M.S.A. and W.A.G.A.-G.; writing—review and editing, I.R.A., K.M.M. and U.L.D.; supervision, F.S.A. and T.I.A.; project administration, I.R.A.; funding acquisition, I.R.A., K.M.M., U.L.D., F.S.A., M.S.A., S.M.S.A., W.A.G.A.-G. and T.I.A. All authors have read and agreed to the published version of the manuscript.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Data availability statement, conflicts of interest.

The authors declare no conflict of interest in conducting this study.

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Fact Sheet | Climate, Environmental, and Health Impacts of Fossil Fuels (2021)

By savannah bertrand.

December 17, 2021

The use of fossil fuels—coal, oil, and natural gas—results in significant climate, environmental, and health costs that are not reflected in market prices. These costs are known as externalities. Each stage of the fossil fuel supply chain, from extraction and transportation to refining and burning, generates externalities. This fact sheet provides a survey of some of the externalities associated with fossil fuels.

Climate Externalities

When fossil fuels are burned, they emit greenhouse gases like carbon dioxide that trap heat in the earth’s atmosphere and contribute to climate change. In 2019, fossil fuels accounted for  74 percent of U.S. greenhouse gas emissions. Nearly 25 percent of emissions in the United States come from fossil fuels extracted from public lands. Some of the climate externalities of fossil fuels include:

• Ocean acidification: At least a quarter of the carbon dioxide emitted from fossil fuels is absorbed by the ocean, changing its chemistry (pH). The increased acidity makes it harder for marine organisms to build shells and coral skeletons. Over the last 150 years, ocean acidity has increased by 30 percent , posing threats to coral reefs, fishing, tourism, and the economy.
• Extreme weather : According to the N ational Oceanic and Atmospheric Administration , climate change, brought upon by burning fossil fuels, is contributing to more frequent and severe extreme weather events that lead to disasters costing at least a billion dollars each. The cost of extreme weather events, including wildfires, hurricanes, wind storms, flooding, and droughts, between 2016 and 2020 in the United States has been estimated at $606.9 billion .
• Sea level rise : Oceanic and atmospheric warming due to climate change is melting glaciers and land-based ice sheets, resulting in global sea level rise . Sea levels have risen about 9 inches since the late 1800s, causing more frequent flooding, destructive storm surges, and saltwater intrusion. With 40 percent of the U.S. population living along the coasts, it is estimated that defending coastal communities from sea level rise could cost $400 billion over the next 20 years.

Environmental Externalities

Fossil fuels have significant environmental externalities including:

• Air pollution : Fossil fuels produce hazardous air pollutants , including sulfur dioxide, nitrogen oxides, particulate matter, carbon monoxide, and mercury, all of which are harmful to the environment and human health (as discussed in the health section below). Air pollution from fossil fuels can cause acid rain, eutrophication (excessive nutrients that can harm aquatic ecosystems by lowering oxygen levels), damage to crops and forests, and harm to wildlife.
• Water pollution: From oil spills to fracking fluids, fossil fuels cause water pollution. Each fracking well uses between 1.5 million to 16 million gallons of water, and the resulting wastewater can be toxic, often containing substances like arsenic, lead, chlorine, and mercury that can contaminate groundwater and drinking water.
• Plastic pollution : Over 99 percent of plastics are made from fossil fuels. Globally, 300 million tons of plastic waste are produced each year, 14 million tons of which end up in the ocean, killing wildlife and polluting the food chain. Plastics also have climate consequences: the U.S. plastic industry produces 232 million tons of carbon dioxide equivalent per year, and the industry’s greenhouse gas emissions are expected to surpass those of coal-fired power plants by 2030.
• Oil spills: Fossil fuel extraction, transportation, and refining can lead to oil spills that harm communities and wildlife , destroy habitats, erode shorelines, and result in beach, park, and fishery closures. The largest oil spill in history, the 2010 BP Deepwater Horizon spill, released 134 million gallons of oil into the Gulf of Mexico, killing 11 people and countless birds, turtles, fish, marine mammals, and plants—and cost BP $65 billion in penalties and cleanup costs.

Health Externalities

Air pollution from burning fossil fuels can cause multiple health issues , including asthma, cancer, heart disease, and premature death. Combusting the additives found in gasoline—benzene, toluene, ethylbenzene, xylene—produces cancer-causing ultra-fine particles and aromatic hydrocarbons. Globally, fossil fuel pollution is responsible for one in five deaths. In the United States, 350,000 premature deaths in 2018 were attributed to fossil fuel-related pollution, with the highest number of deaths per capita in states like Pennsylvania, Ohio, and West Virginia. The annual cost of the health impacts of fossil fuel-generated electricity in the United States is estimated to be up to $886.5 billion .

The environmental and health impacts of fossil fuels disproportionately harm communities of color and low-income communities. Black and Hispanic Americans are exposed to 56 and 63 percent more particulate matter pollution, respectively, than they produce. In a predominantly Black and low-income area of Louisiana known as “Cancer Alley,” the cancer risk is nearly 50 times higher than the national average due to 150 nearby chemical plants and oil refineries.

Policy Mechanisms to Reduce Fossil Fuel Externalities

Several policy mechanisms have been proposed to reduce fossil fuel externalities, including:

• Eliminating fossil fuel subsidies , which could generate $35 billion in taxpayer savings over the next ten years. To learn more about policy mechanisms to phase out fossil fuel subsidies, check out EESI’s fact sheet .
• Increasing the social cost of carbon (SCC) , which estimates the often-uncounted economic damages that result from carbon dioxide emissions. The federal government uses SCC to evaluate the climate impacts of policies.
• A federal clean electricity standard , which would require a percentage of the electricity sold by utilities to come from clean electricity sources. Such standards already exist in several states and usually require the share of clean energy on the electric grid to increase over time.
• A carbon price , which sets a price on carbon dioxide emissions that is paid by emitters. Carbon price policies can be structured in different ways , including as a carbon tax. Cap-and-trade programs like the Northeast's Regional Greenhouse Gas Initiative , in which the market determines a carbon price, have existed at the subnational level for many years, reducing emissions and creating new revenue streams for clean energy investments.

Author: Savannah Bertrand

Editor: Anna McGinn

Graphic: Emma Johnson

For the endnotes, please download the PDF version of this issue brief .

Environmental and economic analysis of the transformation of paper mill sludge treatment technologies in China

• Research Article
• Published: 27 May 2024

Cite this article

• Yanfei Lin 1 ,
• Guoxia Wei 2 ,
• Hanqiao Liu 1 ,
• Yuwen Zhu   ORCID: orcid.org/0000-0003-2759-0656 1 ,
• Qianlong Han 1 ,
• Yunzhen Yang 1 &
• Yi Lian 3  

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Paper mill sludge (PMS) is featured with a high content of cellulose and hemicellulose, and using its characteristics to make paperboard can achieve a high-value utilization of PMS, which has attracted growing interest. In this study, currently prevalent landfill, incineration technologies (generating heat and electricity by incineration), and three paperboard technologies (medium density fiberboard, pulp board, and corrugated paper) were evaluated and compared via life cycle assessment (LCA) and life cycle costing (LCC) methods. LCA results show that the PMS-to-pulp board outperforms others with an energy conservation and emission reduction (ECER) value of − 2.86 × 10 −8 , while the landfill exhibits the highest overall environmental impact with an ECER value of 4.80 × 10 −9 . LCC results reveal that the PMS-to-pulp board delivers the highest economic profit with $257.357, while the landfill is the lowest with $ − 35.63. The PMS paperboard technologies are more economically friendly than the incineration technologies due to additional electricity/steam consumption during the PMS pre-drying process in incineration. In addition, different scenarios were set up to explore national GHG emission reduction potential by increasing paperboard technologies application rate and reducing the proportion of landfill and incineration. The scenario analysis suggests that replacing 90% of landfill and incineration ratio with PMS paperboard technologies could tremendously improve the overall emission reduction performance with − 9.08 × 10 10 kg CO 2 eq. This result indicates that the PMS treatment technology transformation has a significant favorable impact on the achievement of the “carbon neutrality” target.

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The data that supports the findings of this study are available in the Supplementary Information.

Abbreviations

• Paper mill sludge

Medium density fiberboard

• Life cycle assessment
• Life cycle costing

Life cycle inventory

Chinese life cycle database

Energy conservation and emission reduction

Greenhouse gas

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The authors would like to acknowledge the foundation of Tianjin Research Innovation Projects for Postgraduate Students (Grant no. 2022SKYZ208 and Grant no. 2022SKYZ180).

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2024 Environmental Performance Index: A Surprise Top Ranking, Global Biodiversity Commitment Tested

The Baltic nation of Estonia is No. 1 in the 2024 rankings, while Denmark, one of the top ranked countries in the 2022 EPI dropped to 10 th place, highlighting the challenges of reducing emissions in hard-to-decarbonize industries. Meanwhile, “paper parks” are proving a global challenge to international biodiversity commitments.

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In 2022, at the UN Biodiversity Conference, COP 15, in Montreal over 190 countries made what has been called “the biggest conservation commitment the world has ever seen.”  The Kunming-Montreal Global Biodiversity Framework called for the effective protection and management of 30% of the world’s terrestrial, inland water, and coastal and marine areas by the year 2030 — commonly known as the 30x30 target. While there has been progress toward reaching this ambitious goal of protecting 30% of land and seas on paper, just ahead of World Environment Day, the 2024 Environmental Performance Index (EPI) , an analysis by Yale researchers that provides a data-driven summary of the state of sustainability around the world, shows that in many cases such protections have failed to halt ecosystem loss or curtail environmentally destructive practices.

A new metric that assesses how well countries are protecting important ecosystems indicated that while nations have made progress in protecting land and seas, many of these areas are “paper parks” where commercial activities such as mining and trawling continue to occur — sometimes at a higher rate than in non-protected areas. The EPI analyses show that in 23 countries, more than 10% of the land protected is covered by croplands and buildings, and in 35 countries there is more fishing activity inside marine protected areas than outside. 

“Protected areas are failing to achieve their goals in different ways,” said Sebastián Block Munguía, a postdoctoral associate with the Yale Center for Environmental Law and Policy (YCELP) and the lead author of the report. “In Europe, destructive fishing is allowed inside marine protected areas, and a large fraction of the area protected in land is covered by croplands, not natural ecosystems. In many developing countries, even when destructive activities are not allowed in protected areas, shortages of funding and personnel make it difficult to enforce rules.”

The 2024 EPI, published by the Yale Center for Environmental Law and Policy and Columbia University’s Center for International Earth Science Information Network ranks 180 countries based on 58 performance indicators to track progress on mitigating climate change, promoting environmental health, and safeguarding ecosystem vitality. The data evaluates efforts by the nations to reach U.N. sustainability goals, the 2015 Paris Climate Change Agreement, as well as the Kunming-Montreal Global Biodiversity Framework. The data for the index underlying different indicators come from a variety of academic institutions and international organizations and cover different periods. Protected area coverage indicators are based on data from March 2024, while greenhouse emissions data are from 2022.

Estonia has decreased its GHG emissions by 59% compared to 1990. The energy sector will be the biggest contributor in reducing emissions in the coming years as we have an aim to produce 100% of our electricity consumption from renewables by 2030.”

The index found that many countries that were leading in sustainability goals have fallen behind or stalled, illustrating the challenges of reducing emissions in hard-to-decarbonize industries and resistant sectors such as agriculture. In several countries, recent drops in agricultural greenhouse gas emissions (GHG) have been the result of external circumstances, not policy. For example, in Albania, supply chain disruptions led to more expensive animal feed that resulted in a sharp reduction in cows and, consequentially, nitrous oxide and methane emissions.

Estonia leads this year’s rankings with a 40% drop in GHG emissions over the last decade, largely attributed to replacing dirty oil shale power plants with cleaner energy sources. The country is drafting a proposal to achieve by 2040 a CO2 neutral energy sector and a CO2 neutral public transport network in bigger cities.

“Estonia has decreased its GHG emissions by 59% compared to 1990. The energy sector will be the biggest contributor in reducing emissions in the coming years as we have an aim to produce 100% of our electricity consumption from renewables by 2030,” said Kristi Klaas, Estonia’s vice-minister for Green Transition. Klaas discussed some of the policies that led to the country's success as well as ongoing challenges, such as reducing emissions in the agriculture sector, at a webinar hosted by YCELP on June 3.  Dr. Abdullah Ali Abdullah Al-Amri, chairman of the Environment Authority of Oman, also joined the webinar to discuss efforts aimed at protecting the county's multiple ecosystems with rare biodiversity and endangered species, such as the Arabian oryx, and subspecies, such as the Arabian leopard. 

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 Denmark, the top ranked country in the 2022 EPI dropped to 10th place, as its pace of decarbonization slowed, highlighting that those early gains from implementing “low-hanging-fruit policies, such as switching to electricity generation from coal to natural gas and expanding renewable power generation are themselves insufficient,” the index notes. Emissions in the world’s largest economies such as the U.S. (which is ranked 34th) are falling too slowly or still rising — such as in China, Russia, and India, which is ranked 176th.

Over the last decade only five countries — Estonia, Finland, Greece, Timor-Leste, and the United Kingdom — have cut their GHG emissions over the last decade at the rate needed to reach net zero by 2050. Vietnam and other developing countries in Southeast and Southern Asia — such as Pakistan, Laos, Myanmar, and Bangladesh — are ranked the lowest, indicating the urgency of international cooperation to help provide a path for struggling nations to achieve sustainability.

“The 2024 Environmental Performance Index highlights a range of critical sustainability challenges from climate change to biodiversity loss and beyond — and reveals trends suggesting that countries across the world need to redouble their efforts to protect critical ecosystems and the vitality of our planet,” said Daniel Esty, Hillhouse Professor of Environmental Law and Policy and director of YCELP.

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Seeds of Change: Cultivating a Thriving Impact Investing Ecosystem in Philadelphia

ImpactPHL Perspectives

Disclosures.

The devastating consequences of divestment, like deteriorating infrastructure, vacant lots, and vast expanses of food and green space deserts, are glaringly obvious in low-income areas of Philadelphia. These inequalities in resources and opportunities have created a vicious cycle of poverty and made upward mobility very difficult. For the Philadelphia region, relying solely on traditional philanthropic models is insufficient to address these entrenched disparities and complex challenges. Poverty, inequality, and environmental degradation cannot be solved by simply chasing profit margins and depending on philanthropy.

In response to these types of challenges and opportunities across the region and the globe, impact investing has emerged as an increasingly popular approach to provide needed capital to address many of the systemic social and environmental challenges. This approach has gained momentum nationally and globally. The Global Impact Investor Network (GIIN) estimates that the size of the worldwide impact investing market is USD 1.164 trillion. This marks the first time the organization’s widely cited estimate surpassed the USD 1 trillion mark.

The draw of impact investing goes beyond just providing immediate benefits. Impact investing promotes a sense of shared responsibility among stakeholders. When stakeholders engage with local place-based investments that prioritize community engagement and collaboration, investment decisions can align better with the needs and aspirations of those most affected. This participatory approach helps build trust and empower residents, transforming them from passive recipients to active change agents.

“Poverty, inequality, and environmental degradation cannot be solved by simply chasing profit margins and depending on philanthropy.”

These investment decisions have a far-reaching impact beyond the numbers on a balance sheet. Each dollar is intentionally directed towards a struggling neighborhood, an eco-friendly business, or a community-driven enterprise, creating a ripple effect that generates social and environmental impact, touching the lives of countless individuals.

From our Partners

This high-impact approach that has caught the attention of so many throughout the world is also creating systemic growth and change here in the Philadelphia region. Place-based impact investing is a powerful approach to addressing the complex vulnerabilities of the Philadelphia region. It acknowledges the need for targeted and community-specific solutions. Place-based impact investors collaborate with local organizations, residents, and institutions to inject capital into enterprises that drive sustainable development, economic empowerment, and social justice. By intentionally investing in the region’s communities, place-based impact investments can help transform challenges into stepping stones towards a brighter future for the region, both financially and for the well-being of its people.

Philadelphia is home to pioneering investors and enterprises creating a regional impact investing infrastructure weaving a tapestry of change. These community-driven efforts are building an ecosystem that is transforming neighborhoods, businesses, and public spaces in Philadelphia, planting seeds of change that will bear fruit for generations to come.

Let’s look at some pioneering organizations equipped to tackle the challenges different communities face and explore their success stories.

Kensington Corridor Trust:

The Kensington Corridor Trust (KCT) in Kensington, Philadelphia, is an innovative example of community transformation. Instead of imposing solutions from the top down, KCT empowers residents by giving them ownership and control of real estate. The organization acquires properties in a perpetual trust, ensuring long-term affordability and local decision-making. Their innovative model uses grants and mission-aligned investments to acquire properties, which are then leased at affordable rates to community-based entrepreneurs. This generates revenue that is reinvested in the neighborhood, creating a self-sustaining cycle of wealth creation and empowerment. KCT prioritizes community engagement, ensuring residents have a say in their future. This builds trust, fosters ownership, and sparks a sense of responsibility for the neighborhood’s success.

Ben Franklin Technology Partners of Southeastern PA:

Ben Franklin Technology Partners of Southeastern PA (BFTP-SEP) fuels innovation across diverse industries, from healthcare to clean energy, by investing in early-stage technology companies and fostering a thriving ecosystem. They provide capital, expertise, and connections that empower entrepreneurs to navigate the challenging journey from concept to impact. Their success lies in their holistic approach. They partner with universities, research institutions, and other organizations to create a fertile ground for innovation and collaboration. They also champion diversity and inclusion, ensuring that all voices are heard and all communities have a chance to thrive.

The Enterprise Center’s Innovate Capital Growth Fund:

The Enterprise Center’s Innovate Capital takes an equity and opportunity-focused approach to empowering minority and women-owned businesses. Innovate Capital provides growth capital to these often-overlooked entrepreneurs, unlocking generational wealth. This licensed Small Business Investment Company (SBIC) invests not just in dollars but also in the belief of the untapped potential of these diverse founders. They provide resources and mentorship to help these entrepreneurs build sustainable ventures. The key to their success is their collaborative approach – connecting businesses with the right resources, from procurement opportunities to strategic partnerships, and empowering them to build thriving ventures.

Investors Circle Philadelphia:

Investors Circle is a network of passionate investors who support early-stage businesses that tackle critical social and environmental challenges. The organization’s members, including angel investors, venture capitalists, and foundations, share a common vision of driving positive change through their investments. They seek ventures that generate competitive returns while addressing climate change, education, inequality, and healthcare access. Investors Circle goes beyond individual investments, creating impact. They foster collaboration and knowledge-sharing within their network, connecting entrepreneurs with valuable resources and expertise. This creates a fertile ground for innovation and amplifies the impact of their collective capital.

Philadelphia’s impact investing ecosystem has thrived, with various organizations contributing to positive change through their unique focus and collaborative spirit. This has led to revitalized neighborhoods, empowered communities, and a more equitable and sustainable future for some.

“To successfully work with diverse perspectives, it’s necessary to establish long-term partnerships and agree on a common goal. Innovation and scalability are crucial to expanding the capital available for place-based initiatives.”

The impact investing landscape in Philadelphia is growing, but some obstacles remain to overcome. To successfully work with diverse perspectives, it’s necessary to establish long-term partnerships and agree on a common goal. Innovation and scalability are crucial to expanding the capital available for place-based initiatives. Additionally, it’s essential to gather and analyze robust data to make informed investment decisions. Building trust and attracting more investors will require leveraging technology and establishing data-driven frameworks. These challenges are not unique to Philadelphia; most regions with growing impact economies face them. However, the Philadelphia region is intentionally working to address the hurdles that create an efficient and effective regional impact economy.

… learn more about opportunities to scale your positive impact in the region.

About ImpactPHL Perspectives:

ImpactPHL Perspectives is a multi-part content series that explores the many facets of the impact economy in Greater Philadelphia from the perspectives of its doers, movers, shakers, and agents of change. Each volume is written directly by a leader in this space to discuss best practices and share lessons learned while challenging our assumptions about financial and impact returns. For more thought leadership like this, check out the full catalog of ImpactPHL Perspectives.

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Deadly Floods in Brazil Were Worsened by Climate Change, Study Finds

The country’s south received three months’ rain in two weeks. Global warming has made such deluges twice as likely as before, scientists said.

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By Raymond Zhong and Manuela Andreoni

Human-caused warming has doubled the chances that southern Brazil will experience extreme, multiday downpours like the ones that recently caused disastrous flooding there, a team of scientists said on Monday. The deluges have killed at least 172 people and displaced more than half a million residents from their homes.

Three months’ rain fell in a two-week span of April and May in the southern state of Rio Grande do Sul. After analyzing weather records, the scientists estimated that the region had a 1 percent chance each year of receiving so much rain in so little time. In the cooler climate of the 19th century, before large-scale emissions of greenhouse gases, such colossal downpours were far rarer, the researchers said.

Brazil’s south is one of the country’s rainiest regions. As the world gets warmer, the areas of high atmospheric pressure that occasionally form over the Atlantic coast of South America are becoming larger and longer lasting. That pushes more warm, moist air toward the south, where it can fall as rain.

When the latest rains hit, Rio Grande do Sul was still recovering from floods that killed at least 54 people late last year . Three of the four largest floods ever recorded in the state’s capital, Porto Alegre, have now occurred in the past nine months, said Regina Rodrigues, a professor of physical oceanography at the Federal University of Santa Catarina and one of the scientists who worked on the new analysis.

“While significant floods have occurred in the state of Rio Grande do Sul in the past, they are becoming increasingly strong and widespread,” Dr. Rodrigues said at a news conference.

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UN Study Reveals the Hidden Environmental Impacts of Bitcoin: Carbon is Not the Only Harmful By-product

Global Bitcoin mining is highly dependent on fossil fuels, with worrying impacts on water and land in addition to a significant carbon footprint.

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Hamilton, Canada, 24 October 2023 — The extraordinary rise in cryptocurrency prices over the previous decade has prompted huge investments in the cryptocurrency sector. Undeniably, digital currencies have won the faith of the world's top investors, ranging from large corporations and tech millionaires to criminals, money launderers, and sanction busters.

Thanks to blockchain and other technological breakthroughs, digital currencies now constitute an advanced element of the world’s modern financial system. They are said to even have the potential to crush the world’s strongest currencies. 

The surge in the crypto market is comparable to the gold rush. Yet, this exciting market has a hidden dark side. Mining cryptocurrencies can have major environmental impacts on climate, water, and land, according to new research by United Nations scientists. 

Bitcoin is the most renowned and popular cryptocurrency. This motivated the UN scientists to evaluate the environmental impacts of Bitcoin across the world by looking at the activities of 76 Bitcoin mining nations during the 2020–2021 period. The results are shocking. In addition to a substantial carbon footprint, global Bitcoin mining activities have significant water and land footprints.

“Technological innovations are often associated with unintended consequences and Bitcoin is no exception,” said Professor Kaveh Madani , the Director of the United Nations University Institute for Water, Environment and Health (UNU-INWEH), who led this study. “Our findings should not discourage the use of digital currencies. Instead, they should encourage us to invest in regulatory interventions and technological advancements that improve the efficiency of the global financial system without harming the environment.”

According to study results, published by the United Nations University and Earth’s Future journal, during the 2020–2021 period, the global Bitcoin mining network consumed 173.42 Terawatt hours of electricity. This means that if Bitcoin were a country, its energy consumption would have ranked 27th in the world, ahead of a country like Pakistan, with a population of over 230 million people. The resulting carbon footprint was equivalent to that of burning 84 billion pounds of coal or operating 190 natural gas-fired power plants. To offset this footprint, 3.9 billion trees should be planted, covering an area almost equal to the area of the Netherlands, Switzerland, or Denmark or 7% of the Amazon rainforest.

During this time period, Bitcoin's water footprint was similar to the amount of water required to fill over 660,000 Olympic-sized swimming pools, enough to meet the current domestic water needs of more than 300 million people in rural sub-Saharan Africa. The land footprint of worldwide Bitcoin mining activities during this period was 1.4 times the area of Los Angeles. 

The UN scientists report that Bitcoin mining heavily relies on fossil energy sources, with coal accounting for 45% of Bitcoin's energy supply mix, followed by natural gas (21%). Hydropower, a renewable energy source with significant water and environmental impacts, is the most important renewable source of energy of the Bitcoin mining network, satisfying 16% of its electricity demand. Nuclear energy has a considerable share of 9% in Bitcoin’s energy supply mix, whereas renewables such as solar and wind only provide 2% and 5% of the total electricity used by Bitcoin. 

China, by a large margin, has been the biggest Bitcoin mining nation. To offset the carbon emissions from China's coal-intensive Bitcoin mining operations in 2021–2022, about 2 billion trees should be planted, covering an area equivalent to the sum of Portugal and Ireland or 45,000 times the area of Central Park in New York City. Aside from China, the world’s top 10 Bitcoin mining nations in 2020–2021 included the United States, Kazakhstan, Russia, Malaysia, Canada, Germany, Iran, Ireland, and Singapore.

“Because countries use different sources of energy to generate electricity, their electricity production impacts on climate, water, and land are not the same,” said Dr. Sanaz Chamanara , the lead author of the study and an Environmental, Social and Governance (EGS) Research Fellow at UNU-INWEH. “The rankings of countries in terms of the environmental impacts of their Bitcoin operations change depending on which environmental footprint is considered.” 

Norway, Sweden, Thailand, and the United Kingdom are among the countries that make it to the top 10 list when the water or land footprint of their Bitcoin mining activities is taken into account.  Together, the top 10 Bitcoin mining countries in terms of environmental footprint are responsible for 92–94% of Bitcoin’s global carbon, water, and land footprints. 

The UN scientists make a range of recommendations regarding possible interventions by the governments to monitor and mitigate the environmental impacts of cryptocurrencies. They also suggest investment in other types of digital currencies that are more efficient in terms of energy use and less harmful to the environment. The investigation also calls for attention to the transboundary and transgenerational impacts of mining cryptocurrencies. “When you note which groups are currently benefiting from mining Bitcoin and which nations and generations will suffer the most from its environmental consequences, you can’t stop thinking about the inequity and injustice implications of the unregulated digital currency sector,” said Madani.

• The cryptocurrency sector provides valuable opportunities and benefits, but has major, overlooked environmental impacts.
• Bitcoin, the most popular cryptocurrency, has concerning impacts on climate, water, and land.
• Bitcoin price and energy use for Bitcoin mining are highly correlated.
• A 400% increase in Bitcoin’s price from 2021 to 2022 triggered a 140% increase in the energy consumption of the worldwide Bitcoin mining network. 
• China was the world’s top Bitcoin miner in 2020–2021, followed by the USA, Kazakhstan, Russia, Malaysia, Canada, Germany, Iran, Ireland, and Singapore.
• In addition to the top 10 Bitcoin mining nations, Sweden, Norway, Singapore, and the UK are among the world’s top contributors to the carbon, water, and land footprints of Bitcoin. 
• 67% of the electricity consumed for Bitcoin mining in 2020–2021 was produced from fossil energy sources.
• As the primary energy source for Bitcoin mining, coal provided 45% of the overall electricity used for Bitcoin mining globally during the 2020¬–2021 period.
• Bitcoin mining emitted over 85.89 Mt of CO2 during the 2020–2021 period.
• The greenhouse gas emissions of Bitcoin mining alone could be sufficient to push global warming beyond the Paris Agreement's goal of holding anthropogenic climate warming below 2 degrees Celsius.
• The top ten Bitcoin mining nations are together responsible for 92–94% of the global carbon, water, and land footprint of Bitcoin.
• To offset the CO2 emissions of Bitcoin mining in 2021–2022, 3.9 billion trees must be planted, taking up an area equivalent to the size of the Netherlands, Switzerland, or Denmark, or 7% of the Amazon rainforest.
• China's coal-intensive Bitcoin mining produced more than 41 Mt CO2eq in 2020–2021. 
• Just to offset the carbon footprint of China’s Bitcoin mining operations in 2020–2021, about 2 billion trees are needed, taking up an area equivalent to the sum of Portugal and Ireland or 45,000 times the area of New York’s Central Park.
• Hydropower, an energy resource with major water and environmental impacts, is the main renewable energy source of electricity for Bitcoin, satisfying over 16% of the total electricity demand of the global Bitcoin mining network.
• Nuclear energy provides 9% of the total electricity used for Bitcoin mining globally.
• Only 2% and 5% of the total electricity used for mining Bitcoin came from solar and wind energy sources, respectively.
• The global water footprint of Bitcoin mining in 2020–2021 was 1.65 km3, exceeding the domestic water use of over 300 million people in rural sub-Saharan Africa.
• The land footprint of the global Bitcoin mining network in 2020–2021 was more than 1,870 square kilometers — 1.4 times the area of Los Angeles.
• China's share in Bitcoin mining dropped from 73% (2020) to 21% (2022) due to the government’s interventions, while the shares of the United States and Kazakhstan increased by 34% and 10%, respectively.
• Countries with low electricity prices, like Kazakhstan, where electricity price is three times cheaper than that in the US, are Bitcoin mining heavens providing major financial incentives for Bitcoin mining that is heavily reliant on non-renewable energy sources.
• Urgent regulatory intervention and technological breakthroughs are needed to mitigate the environmental impacts of the digital currency sector, which is rapidly growing.

Read the paper, summarizing the main findings of the study : Chamanara, S., Ghaffarizadeh, S. A., & Madani, K. (2023). The environmental footprint of Bitcoin mining across the globe: Call for urgent action. Earth's Future, 11, e2023EF003871. https://doi.org/10.1029/2023EF003871  

Read the full report : Chamanara, S. & Madani, K. (2023). The Hidden Environmental Cost of Cryptocurrency: How Bitcoin Mining Impacts Climate, Water and Land, United Nations University Institute for Water, Environment and Health (UNU-INWEH), Hamilton, Ontario, Canada, https://inweh.unu.edu/  

Media contacts

Kyra Bowman , UNU Head of Communications, [email protected]   Maryam Mottalebi , UNU-INWEH Digital Communications Associate, [email protected]  

The UNU-INWEH team is available for interviews:

Prof. Kaveh Madani Director United Nations University Institute for Water, Environment and Health [email protected]  

Dr. Sanaz Chamanara  Research Fellow, Environmental, Social and Governance (EGS)  United Nations University Institute for Water, Environment and Health [email protected]    

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Group says it intends to sue US agencies for failing to assess Georgia plant's environmental impact

A conservation group says it intends to sue two U.S. agencies, saying they failed to properly assess the environmental impacts of the sprawling electric vehicle plant Hyundai is building in Georgia

SAVANNAH, Ga. -- A Georgia conservation group Monday filed notice of its intent to sue two U.S. government agencies, saying they failed to properly assess the environmental impacts of the $7.6 billion electric vehicle and battery plant Hyundai is building outside Savannah.

The Ogeechee Riverkeeper accuses the Army Corps of Engineers of issuing a permit to fill or dredge wetlands on the plant site using outdated data that failed to consider the project's final scale. And it says the agency wrongly assumed the project would have a negligible impact on the region's groundwater supply.

The environmental group also says the U.S. Treasury Department dispersed millions of dollars in infrastructure funding that benefitted the project without performing required environmental reviews.

“Any activities related to this project should be immediately halted until these crucial steps are properly completed,” said a letter addressed to the agencies' leaders by Donald D.J. Stack, an attorney representing the conservation group.

Hyundai Motor Group broke ground in 2022 on its first U.S. factory devoted to building electric vehicles and the batteries that power them. The South Korean automaker has said it hopes to begin production before the end of this year in Bryan County west of Savannah.

Ultimately, Hyundai plans to have 8,000 workers producing 300,000 EVs per year at the Georgia site, making it the largest economic development project the state has ever tackled. The plant site sprawls across more than 2,900 acres (1,170 hectares).

Spokespersons for Hyundai and the two federal agencies named in the environmental group's letter did not immediately respond to email messages seeking comment Monday evening.

The letter says the group plans to file suit after 60 days if construction of the Hyundai plant isn't halted while the Army Corps and Treasury Department perform updated environmental reviews.

“When we find out that permit applicants withhold important information in an application and the permitting agency hasn’t done their due diligence, we will call them out and use the law to hold them accountable,” Damon Mullis, the riverkeeper group's executive director, said in a statement.

The group's letter says the Army Corps granted the project's permit in 2022 largely using information from a 2019 application submitted by a local agency before there was a deal with Hyundai to build in Georgia. It says the project grew by more than 500 acres (202 hectares) in that period.

The riverkeeper group's letter also says the Army Corps “severely underestimated” impacts to the area's water supply. It says agency granted a permit without information on how much water the plant would use, wrongly assuming a “negligible” impact that Bryan County's local water system could accommodate.

However, Georgia environmental regulators are now considering permit applications for four wells in a neighboring county that would allow the Hyundai plant to withdraw a combined 6.5 million gallons of water per day. They would come from the groundwater aquifer that’s the region’s main source of drinking water.

The riverkeeper group says the Treasury Department violated the National Environmental Policy Act by failing to perform an environmental review before dispersing an estimated $240 million to help pay for water and wastewaters infrastructure improvements benefitting the Hyundai plant. It says the funding came from a $1.9 trillion pandemic relief package Congress approved in 2021.

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Washington judge denies GOP attempt to keep financial impact of initiatives off November ballots

FILE - A person puts their ballot in a drop box on Oct. 27, 2020, at a library in Seattle. A Washington state judge on Friday, June 7, 2024, turned back an attempt by GOP backers of three initiatives to keep the fiscal impact of the measures off the November ballot. (AP Photo/Ted S. Warren, File)

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Information about how much money three GOP-backed initiatives would cost the state of Washington must appear on the November ballot where voters can see it, a judge on Friday ruled.

The measures to repeal the state’s landmark Climate Commitment Act and the tax on the sale of stocks and bonds as well as one that could threaten a long-term care insurance program require financial disclosures, Thurston County Superior Court Judge Allyson Zipp said in a ruling from the bench. The decision is based on a recent law that requires the state attorney general to spell out how funding would be affected by initiatives that repeal, impose or change any tax or fee.

Opponents of the measures, who said they would have massive impacts on the state’s ability to provide critical services, praised the judge’s decision.

“Their lawsuit had one inexcusable purpose: to hide the truth about the impacts of these initiatives from voters,” Aaron Ostrom, executive director of the progressive advocacy organization FUSE Washington, said in a statement. “They know they will lose if voters understand what these destructive, deceptive initiatives actually do.”

Initiative author Jim Walsh, who along with Deanna Martinez sued to keep the fiscal impact off the ballot , said in an email to The Associated Press that they were concerned the “warning label” would be “weaponized.”

“We don’t mind the idea of more information, said Walsh, chair of the state Republican Party and a state representative from Aberdeen. ”What we’re concerned about is it won’t be impartial information. It will be partisan rhetoric, weaponized to make the initiatives sound bad. The fight isn’t over. We are going to continue to make the point that we want unbiased non-political information.”

Martinez is the chair of Mainstream Republicans of Washington and is on the Moses Lake City Council.

The initiatives are just a few of the ones certified after the group Let’s Go Washington, which is primarily bankrolled by hedge fund executive Brian Heywood, submitted hundreds of thousands of signatures in support of them. Initiatives that would give police greater ability to pursue people in vehicles, declare a series of rights for parents of public-school students and bar an income tax were approved by lawmakers. Heywood did not immediately respond to a voicemail seeking comment.

Tim O’Neal, an analyst with the Washington Community Alliance, said in response to the decision that when voters don’t have all the facts, they are less likely to vote and have their voice heard.

“The Public Investment Impact Disclosure law is important to building the transparency we need to increase voter trust and participation in our constitutional democracy,” he said in a statement.

Initiative 2117 would repeal the state’s Climate Commitment Act, which works to cap and reduce pollution while creating revenue for investments that address climate change. It raised $1.8 billion in 2023 through quarterly auctions in which emission allowances are sold to businesses covered under the act.

Initiative 2109 would repeal the tax imposed on the sale or exchange of stocks, bonds and other high-end assets, with exemptions for the first $262,000. Initiative 2124 will decide whether state residents must pay into Washington Cares, the state’s public long-term care insurance program.

Washington legislators passed a law in 2022 that requires descriptions of how much money initiatives would cost Washington to be printed on the ballot.

Walsh and Martinez claimed the law doesn’t apply to the three measures and asked the court to bar Washington Attorney General Bob Ferguson from preparing statements on their fiscal impact and bar the secretary of state from certifying those statements.

But lawyers for the state said under the law, the public has a right to know an initiative’s financial impact.

Dr. Stephan Blanford, executive director of the Children’s Alliance, a nonpartisan child advocacy organization, said initiatives would give tax breaks to millionaires and billionaires while cutting funding for education. He also said the initiative to repeal the capital gains tax would push the state’s education system further into the red.

“By jeopardizing $8.1 billion in long-term care funding, I-2124 will put more tax pressure on Millennials and Gen Z to pay for a tidal wave of state Medicaid costs for aging Washingtonians, and increase the cost of care for millions of middle-income families,” he said.

The initiative to repeal the state’s carbon market “would allow more pollution across Washington, devastate funding air, water, and land protection, and cut funding to prevent wildfires and investments in transportation,” he said.