Greta Jimenez
Despite global efforts to address climate change, such as the Paris Climate Agreement and COP28, certain nations continue to be the largest contributors to pollution. The top polluting countries are primarily driven by industrialisation, high deforestation rates, and the use of fossil fuels, particularly coal. China consistently ranks as the top polluter due to its extensive use of coal and oil, with the US and India often following closely behind. However, when considering per-capita emissions, the ranking changes, with countries in the Arabian Peninsula taking the lead due to their large oil industries and small populations.
| Characteristics | Values |
|---|---|
| Date of Data | 2022-2025 |
| Criteria | CO2 emissions, per capita, ecological footprint |
| Top Polluting Countries | China, USA, India, Qatar, Kuwait, Saudi Arabia, Germany, Russia, Brazil, EU |
| Most Polluted Cities | 14/15 of the most contaminated cities are in India |
| Cause of Pollution | Burning of fossil fuels, generation of energy through non-renewable channels, polluting human activities, heavy dependence on coal, oil industry, cement manufacture |
| Global Initiatives | Kyoto Protocol, COP28, CBAM in Europe, Inflation Act in the USA, Global Carbon Budget |
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What You'll Learn
China's extensive use of coal
China is the world's largest consumer, producer, and importer of coal. In 2020, China's coal production accounted for approximately half of the global total, at 3.84 billion tonnes. In 2021, this figure rose to over half of the world's total, with China's coal consumption and production each accounting for around 50% of the global total. China's coal consumption generated 7.24 billion tonnes of CO2 in 2019, approximately 14% of global greenhouse gas emissions. China has committed to peak carbon emissions by 2030 and achieve carbon neutrality by 2060.
The use of coal in China dates back thousands of years. Historians suspect that ancient people in current-day China used coal for surface mining around 3490 BC. In the 3rd century BC, the Chinese began burning coal for heat. By the 11th century, coal was the main source of fuel in the capital, Kaifeng, and it had replaced charcoal in the region. By 1000 AD, Chinese mines were ahead of most mining advancements globally.
Coal is the most abundant mineral resource in China, and it is widely used for generating electricity, producing heat, and in various industries. In 2020, 60% of coal was used for electricity and heat generation, with the industrial sector accounting for a significant portion of demand. China's industrial growth and economic development are closely linked to its high coal consumption. The steel industry, in particular, relies heavily on metallurgical coal. Additionally, coal is used in rural areas for residential purposes, although coal burning in these areas has severe health impacts.
Despite China's recent initiatives to combat climate change, the country continues to face challenges in reducing its coal capacity. In 2021, efforts to limit coal use resulted in electricity outages, leading the government to relax environmental standards. China's coal sector employs 2.6 million workers, and the transition away from coal is critical. While global coal use declined in 2022, China added 26.8 GW of coal capacity, and its coal projects under development represent 68% of the global total.
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India's burning of fossil fuels
India is the world's second most populous country and the third-largest economy, and it is undertaking enormous efforts to provide modern energy products and services to millions of households living in energy poverty. As a member of the G20, India committed in 2009 to "phase out inefficient fossil fuel subsidies that encourage wasteful consumption... while providing targeted support for the poorest." Despite these commitments and initiatives, India's burning of fossil fuels has grown significantly.
India's solar generation capacity has grown by 25% per year, and wind energy by 5% per year, while coal has risen by just 1% annually. However, in 2022, fossil fuels accounted for 88% of primary energy consumption in India, including 77% of total electricity generation. Coal, oil, and natural gas are the dominant fossil fuels in India's energy mix. In 2022, coal consumption dominated primary energy consumption in the country, with the majority of coal used in power plants for electricity generation. Oil and natural gas, on the other hand, were mainly utilised by the transportation industry.
India's fossil fuel industry is expected to face competition from renewable energy sources in the future. The government has introduced taxes on fossil fuels, but it also subsidises bulk purchases. Fossil fuel subsidies have been driving indoor air pollution, and a recent study estimates that subsidy reform and fuel taxation could help India prevent 65% of premature deaths caused by air pollution.
India's rapid economic growth and modernisation mean that its energy consumption will continue to rise. This has resulted in India being ranked as the third most polluting country globally, with fourteen of the world's 15 most contaminated cities located within its borders, according to the World Health Organization. India's burning of fossil fuels has contributed significantly to its high pollution levels, and the country faces the challenge of transitioning to cleaner energy sources while meeting its growing energy demands.
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US industrial revolution period
The Industrial Revolution, which began in Britain in the late 18th century, marked a period of mass industrialization and economic growth. This period, however, came at a significant cost to the environment, with the intensive use of fossil fuels and the sharp increase in carbon emissions. The US, in particular, experienced a range of environmental issues during and after its industrialization.
The American Industrial Revolution, which unfolded in multiple phases, had a profound impact on the nation's environment. The First Industrial Revolution, which began in the US in the mid-18th century, introduced new technologies that led to faster production and consumption. This phase was marked by the use of coal-powered steam engines, which released factory emissions into the atmosphere. The Second Industrial Revolution, or Technological Revolution, brought about electricity, steel production, and the internal combustion engine. This phase drove mass production and the growth of heavy industries, leading to exponential increases in energy consumption and resource extraction.
One of the most notable consequences of industrialization in the US was the severe pollution of waterways. Rivers such as the Thames, which flows through London, became dumping grounds for industrial waste, oil, and debris. Improper mining practices also led to toxic pollutants running off into waterways, further degrading the environment. The environmental consequences of industrialization extended beyond pollution, with natural resources being exploited and urban areas becoming overcrowded.
The Industrial Revolution set in motion a pattern of unchecked resource exploitation and high emissions that continue to affect the US and the world today. The focus on productivity and economic growth during this period came at the expense of environmental sustainability, and the lack of meaningful environmental regulations allowed for long-term damage to both the environment and public well-being. The environmental impact of the Industrial Revolution in the US was profound and far-reaching, and it continues to be a challenge for the nation to address these issues and reduce their emissions.
While I cannot provide a definitive ranking of the most polluting nations as it may change over time and vary depending on the specific pollution metrics used, I can provide some insight based on the current information available. As of 2024, India is ranked as the third most polluting country, with fourteen of the world's 15 most contaminated cities located within the country. China, the world's most populated country, is also noted for its high levels of industrial pollution, with Beijing experiencing frequent red alerts for environmental pollution. Additionally, the biggest country geographically deals with high levels of deforestation and animal hunting, and a high dependence on oil, coal, gas, and fossil fuels.
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EU's carbon leakage
While almost all countries are responsible for the high level of global pollution, the five most polluting countries are China, the United States, India, Russia, and Japan. China, the world's most populous country, has an enormous export market, and its industries emit more carbon dioxide than those of any other country. India, which has experienced several environmental emergencies, has seen the burning of fossil fuels grow significantly in recent decades.
In Europe, the EU Emissions Trading System (EU ETS) is the largest emissions trading system globally and plays a crucial role in Europe's efforts to combat climate change. However, carbon leakage has been a central issue within the EU ETS framework. Carbon leakage occurs when industries relocate to countries with laxer emission constraints to avoid the costs associated with stringent climate policies, leading to an increase in emissions in those regions.
To address carbon leakage, the EU introduced the Carbon Border Adjustment Mechanism (CBAM) in 2023. CBAM imposes carbon pricing on imports to reduce carbon leakage, prevent unfair competition, and incentivize global climate policy alignment. It is estimated to reduce carbon leakage by 19%.
Under the EU ETS, industrial installations at significant risk of carbon leakage receive special treatment to support their competitiveness. The European Commission draws up a list of sectors and sub-sectors considered to be at significant risk of carbon leakage, with the agreement of Member States and the European Parliament. These sectors and sub-sectors receive a higher share of free allowances compared to other industrial installations.
The criteria for determining whether a sector or sub-sector is at significant risk of carbon leakage have evolved. In Phase 3 of the EU ETS, a sector or sub-sector was considered at significant risk if the direct and indirect costs induced by the directive would increase production costs by at least 5%. For Phase 4 (2021-2030), a new list was adopted, based on more stringent criteria and improved data.
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Arabian Peninsula's oil industry
While almost all countries contribute to global pollution, the top five most polluting countries are China, the United States, India, Russia, and Japan.
The Arabian Peninsula has the largest oil reserves in the world. Oil was first discovered in the region in 1932, in Bahrain. The mineral resource is of great value, and the oil industry in the region has had a significant impact on the environment.
Saudi Arabia, for example, has experienced the environmental consequences of its oil industry. Oil spills, hydraulic fracturing, and air pollution are some of the issues the country faces. The 1991 Gulf War Oil Spill, which directly affected the Saudi Arabian shoreline, is considered the world's most severe oil spill. The Kingdom is now implementing a plan to restore the Gulf Coast from oil pollution.
Saudi Arabia's oil industry also contributes to carbon dioxide emissions and energy overconsumption, leading to ground, water, and air pollution. The growing industrial agriculture sector and urbanization further deplete water resources, cause deforestation, and contribute to soil contamination. Private transportation and car usage are major contributors to air pollution and the presence of heavy metals in urban soils, which are harmful to both humans and plants.
To address these environmental challenges, Saudi Arabia has established the General Authority of Meteorology and Environmental Protection (PME), which handles all environmental policies.
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Frequently asked questions
China is the world's biggest polluter, with 9.9 billion tons of CO2 emitted in 2020, largely due to its extensive use of coal and imported oil.
The United States is the second-largest polluter, with 4.4 billion tons of CO2 emitted in 2020, due to its gasoline-fuelled transportation industry.
India is the third-largest polluter, with 2.3 billion tons of CO2 emitted in 2020. India's main energy source is coal, supplying about 44% of the energy in the country.
Russia and Japan are also among the top five countries with the highest carbon dioxide emissions.
Pollution levels are influenced by a country's industrialisation, population, and energy sources. The use of fossil fuels, particularly coal, oil, and gas, contributes significantly to a country's carbon dioxide emissions.
