Helena Joyce
The world is facing a climate catastrophe, and scientists warn that time is running out to reduce the use of fossil fuels. The Climate Action Tracker, an independent research group, revealed that in 2022, 50 billion metric tons of planet-heating gases were emitted. China was the largest climate polluter, contributing to nearly 30% of global emissions. Other countries that are significant contributors to pollution include the United States, the European Union, India, and Russia. The top 20 global polluters, dominated by these countries, were responsible for 83% of emissions in 2022. The largest sources of these emissions include the use of fossil fuels, the generation of energy through non-renewable channels, and polluting human activities.
| Characteristics | Values |
|---|---|
| Top polluting countries | China, India, the United States, and the European Union |
| China's emissions | More than 14 billion tons of CO2 |
| US per capita emissions | Nearly twice as much climate pollution per person compared to China |
| India's per capita emissions | Significantly below the global average |
| Top polluting industries | Construction, technology, plastics manufacturing, waste management and landfills, chemical manufacturing, fossil fuels |
| Construction's contribution to air pollution | 23% |
| Fossil fuel companies' responsibility | Carbon era and acceleration of the climate crisis |
| Global emissions (1965-2017) | 12,352 million tons of CO2 equivalent, 0.91% of the global total |
| Global emissions (1990-2019) | 61.9% increase in energy emissions |
| Global emissions (2020-2021) | 4.9% decrease in 2020 followed by a 0.1% increase in 2021 |
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What You'll Learn
Fossil fuels and cement manufacture
Fossil fuels and cement manufacturing are significant contributors to global pollution. The largest part of greenhouse gas emissions comes from the use of fossil fuels, the generation of energy through non-renewable channels, and polluting human activities.
In 2023, half of the world's fossil fuel and cement carbon dioxide emissions came from just 36 entities, according to the Carbon Majors Project. If Saudi Aramco were a country, it would be the world's fourth-largest polluter, after China, the US, and India. Eight Chinese entities contributed to 17.3% of global fossil fuel and cement CO2 emissions in 2023.
Five publicly traded oil companies—ExxonMobil, Chevron, Shell, TotalEnergies, and BP—together accounted for 5% of global carbon dioxide emissions from fossil fuels. Exxon, for example, has a goal of boosting its annual earnings potential by more than 140% by 2025 through various projects that are expected to increase its production to around five million oil-equivalent barrels per day.
Coal was the largest source of emissions in 2023, representing 41.1% of emissions and continuing a steady upward trend since 2016. Cement manufacturing saw the largest relative increase in emissions at 6.5%, driven by expanding production. The total emissions from cement production (including heating fuels) are approximately 2.8 billion tons of CO2, or about 8% of world CO2 production. If the cement industry were a country, it would be the third-largest emitter, after China and the US.
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Construction
The construction industry is a major consumer of resources, using vast amounts of natural resources and contributing to the emission of greenhouse gases. Building materials such as concrete, aluminum, and steel are directly responsible for large quantities of CO2 emissions due to their high embodied energy content. The industry also consumes a large amount of global freshwater, with construction processes and day-to-day activities contributing to water pollution.
In the US, the Environmental Protection Agency (EPA) has implemented rules and regulations to reduce the negative impact of the construction industry on the environment and climate. The EPA's standards prioritize environmental preservation and require construction firms to design, install, and maintain erosion controls to minimize the discharge of pollutants.
To achieve net-zero emissions, the construction industry must adopt more sustainable practices and materials, increase energy efficiency, offset residual emissions, and monitor air quality levels at construction sites. Strategies such as using eco-friendly building materials, implementing erosion and sediment controls, reducing waste through recycling, and obtaining green building certifications can help lower carbon emissions and protect natural resources.
With the projected growth of the construction industry, it is essential to implement sustainable construction practices to mitigate the environmental impact and promote healthier environments for future generations.
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Technology
The construction industry, which is heavily reliant on technology, is also a major contributor to air pollution, releasing dust and gases, and using energy-intensive machinery. It is estimated that construction causes 23% of air pollution, particularly in fast-growing urban areas.
Another example of the intersection of technology and pollution is in waste management and landfills, which generate about 20% of global methane emissions. Technology can provide solutions, such as waste-to-energy tech, but it is also part of the problem. Plastics manufacturing, for instance, pollutes the air and water, especially through burning and improper recycling, releasing toxic chemicals into the environment.
The use of technology in chemical manufacturing also has environmental impacts, as the release of VOCs, NOx, SO₂, and PM contributes to smog, acid rain, and serious health issues. While technology has improved our lives in many ways, its rapid growth has also made it a significant contributor to pollution, and so it is important to consider the environmental impacts of these advancements.
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Plastics manufacturing
Plastic manufacturing is a significant contributor to global pollution, with its impact expected to increase in the coming decades. The production of plastic is derived from fossil fuels, which are extracted from the ground and contribute to greenhouse gas emissions.
A 2021 analysis by Beyond Plastics predicted that the US plastics industry would be a more significant contributor to climate change than coal-fired power by 2030. This is due to the exponential increase in plastic production over the past decades, with global production increasing from 2 million metric tons in 1950 to 460 million metric tons in 2019. The Organization for Economic Co-operation and Development (OECD) estimates that plastic use will triple by 2060, indicating a looming crisis.
The process of turning fossil fuels into plastic results in both air and water pollution. The air pollution from these facilities contains over 100 concerning chemicals, including carcinogens such as benzene, toluene, ethylbenzene, and xylene. These pollutants contribute to health issues in nearby communities, including asthma, lung cancer, brain and organ damage, and cardiovascular diseases.
In terms of water pollution, the small plastic pellets produced by these facilities often spill into waterways, endangering aquatic life. The chemicals released during production are also toxic to aquatic animals and accumulate in the food chain.
The issue of plastic pollution is not limited to the manufacturing process but extends to the disposal of plastic waste. Single-use plastics, which constitute a significant portion of plastic pollution, are challenging to recycle and often end up in landfills, rivers, and oceans. Recycling methods can introduce microplastics into the environment, and recycled plastic degrades over time, eventually becoming waste.
To address the problem of plastic pollution, a shift towards producer responsibility schemes is necessary. This would place the onus on manufacturers to reduce plastic usage and adopt sustainable alternatives. Additionally, policies that recognize the link between climate change and plastic pollution are crucial to reducing the reliance on single-use plastics and curbing the growing impact of plastic manufacturing on the environment.
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Chemical manufacturing
The chemical manufacturing industry is a large source of pollution worldwide, with close to 200 polluted sites in the Blacksmith Institute's database. The majority of these sites are in China, Eastern Europe, and South Asia. Eastern Europe carries a disproportionate number of the at-risk population, with over 3 million people at risk of exposure to pollutants from chemical manufacturing. The industry is diverse and global, with 16 countries contributing to the trading and selling of chemicals. The US Environmental Protection Agency (EPA) defines chemical manufacturing as "creating products by transforming organic and inorganic raw materials with chemical processes."
To address the environmental impact of chemical manufacturing, cleaner production methods and pollution prevention programs can be employed. This includes using closed-loop systems to minimize waste, implementing process optimization and energy efficiency measures, and adopting safer, less toxic, and more environmentally friendly chemical production methods.
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Frequently asked questions
The top three polluting industries in the world are construction, technology, and plastics manufacturing. Construction causes 23% of air pollution through the release of dust and gases, and the use of energy-intensive machinery. Technology, including data centres and cryptocurrency, uses huge amounts of electricity and is rapidly becoming a major emissions source. Plastics manufacturing pollutes the air and water, especially through burning and improper recycling, releasing toxic chemicals into the environment.
The countries that are the biggest polluters are China, India, the United States, and the European Union. China is the biggest emitter, with more than 14 billion tons of CO2 released, primarily driven by its extensive use of coal. However, the average American is responsible for nearly twice as much climate pollution as the average person in China. India has far lower per capita emissions than China but its emissions are projected to increase as the country develops.
Some examples of environmental disasters caused by pollution include the Exxon Valdez oil spill in 1989, where about 37,000 tons of oil was spilled into the sea, befouling more than 1,000 miles of coastline. Another example is the sinking of the tanker Erika in 1999, where 20,000 tons of toxic fuel oil polluted the sea, devastating 250 miles of beaches and shoreline, and crippling local industries. More recently, in 2023, the MSC Elsa 3 cargo ship sank off the coast of Kerala, releasing hundreds of containers of hazardous chemicals and over 450 tons of oil and fuel into the ocean.
