Helena Joyce
The world is facing a climate catastrophe, and scientists warn that time is running out to reduce planet-heating emissions. While all countries have a role to play in addressing the climate crisis, the top 20 global climate polluters, dominated by China, India, the United States, and the European Union, were responsible for 83% of emissions in 2022. China, with its heavy reliance on coal, is the biggest emitter, contributing nearly 30% of global emissions. However, when considering per capita emissions, the average American is responsible for nearly twice as much climate pollution as the average person in China. India, with its steep emissions rise, is the third-largest polluter, and the World Health Organization identifies 14 of the 15 most contaminated cities globally as Indian. The United States, despite leading initiatives against climate change, remains a major industrial and commercial power with significant CO2 emissions.
| Characteristics | Values |
|---|---|
| Countries responsible for most pollution | China, the United States, India, Russia, Japan, Germany, Brazil, Indonesia |
| Reason for China's pollution levels | Export of consumer goods, heavy reliance on coal, use of motor vehicles, large importer of oil |
| Reason for US pollution levels | Dominance of gasoline-fuelled transportation industry, heavy reliance on fossil fuels |
| Reason for India's pollution levels | Burning of fossil fuels, small population of the highly polluting oil industry |
| Reason for Russia's pollution levels | Large natural gas deposits, use of coal in chemical and basic materials industries and for power generation |
| Reason for Germany's pollution levels | Coal-reliant energy industry |
| Reason for Brazil's pollution levels | Deforestation |
| Reason for Indonesia's pollution levels | Deforestation |
| Global initiatives to combat climate change | Paris Climate Agreement, COP28, CBAM in Europe, Inflation Act in the US |
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What You'll Learn
China's emissions
China, formally known as the People's Republic of China, is the world's second-largest economy and the second most populous country. China is the world's largest annual greenhouse gas emitter, with emissions stemming mainly from coal burning, including coal power, coal mining, and blast furnaces producing iron and steel. In 2020, China emitted 12.3 billion tonnes of carbon dioxide equivalent (GtCO2e), amounting to 27% of global greenhouse gas emissions. China's per capita emissions correspond to over 10.1 tonnes of CO2eq emitted per person each year, over the world average.
China's economy has been slowing down, which has had implications for global energy markets and carbon dioxide emissions. The vast majority of CO2 emissions in the energy sector come from the burning of fossil fuels such as coal, oil, and natural gas for power generation or to fuel vehicles and machines. Fossil fuel heating is the predominant source of residential emissions in most countries, and in industry, emissions come primarily from burning fossil fuels to produce heat for industrial processes such as making paper or steel. China is home to half of the world's coal power plants and is the world's fifth-largest oil producer and the second-largest for oil consumption.
China has committed to peak emissions by 2030 and net-zero by 2060. In 2024, China recorded a 3% decrease in greenhouse gas emissions compared to the previous year, mainly due to an expansion in wind and solar power capacities. However, China continues to build coal-fired power stations and has promised to "phase down" coal use from 2026. China's targets are likely to be met, but they may not be enough to combat global warming.
China has been participating in international climate negotiations under the United Nations Framework Convention on Climate Change (UNFCCC) since the early 1990s. As a non-Annex I party to the convention, China is not obligated to contribute climate finance or make binding emissions cuts under the Kyoto Protocol. China's position as "the world's largest developing country" has been questioned, given its growing economy, energy use, and emissions.
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US industrial revolution impact
The US is the second-largest emitter of CO2, with 4.4 billion tonnes of CO2 emitted in 2022, and 4,911 million metric tons in 2023. This is largely attributed to its industrial revolution period and heavy reliance on fossil fuels, particularly coal.
The Industrial Revolution in the US had a profound impact on the environment, marking the start of the intensive use of fossil fuels, which is the driving force behind climate change. The consequences of this environmental impact are still felt today, as the US continues to be one of the world's largest emitters of carbon dioxide. The Industrial Revolution in the US led to a sharp increase in carbon emissions, with factory emissions from coal-powered steam engines released into the atmosphere. This caused significant increases in air pollution, with industrial city air polluted by thick smog and American waterways heavily polluted by oil and debris from improper industrial practices. The rapid industrial growth outpaced the ability to manage waste and emissions, resulting in long-term damage to both the environment and public well-being. Overcrowding in cities also led to poor sanitation and unhealthy living conditions, causing serious public health issues.
The First Industrial Revolution, which began in Britain in the late 18th to early 19th centuries, introduced steam power and mass coal burning to the US. This marked the beginning of large-scale fossil fuel use, particularly coal, and led to substantial increases in CO2 emissions. The Second Industrial Revolution, in the late 19th to early 20th centuries, introduced electricity, steel production, and the internal combustion engine, driving mass production and the growth of heavy industries across the US. Each phase of industrialization added to the environmental strain, with global GHG emissions rising significantly during this time.
To combat climate change, the US has introduced the Inflation Act, which includes measures to address inflation and promote sustainable practices. The act encourages clean energy investments, provides tax credits for renewable projects, and aims to accelerate the transition to a low-carbon economy.
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India's rising pollution
India is one of the world's most polluted countries, with 17 of the world's 30 most polluted cities located within its borders. Delhi, the nation's capital, is the most polluted capital city globally, with particulate matter concentrations nearly ten times higher than World Health Organization guidelines. India's air pollution is a serious environmental issue, threatening the health and economy of the country.
The main contributors to India's air pollution include industrial and vehicular emissions, construction dust and debris, thermal power plants, burning of crop residue, and the burning of wood and dirty fuels for cooking and heating by low-income and rural households. In particular, 51% of India's air pollution is caused by industrial pollution, 27% by vehicles, 17% by crop burning, and 5% by other sources.
The health impacts of air pollution in India are severe, with respiratory and cardiovascular diseases such as asthma, bronchitis, COPD, lung cancer, and heart attacks on the rise. According to the State of Global Air 2024, air pollution accounts for more than 2 million deaths annually in India. The economic losses due to premature deaths and morbidity associated with air pollution amounted to $36.8 billion in 2019, equivalent to 1.36% of India's gross domestic product (GDP).
To address this issue, the Indian government launched the National Clean Air Programme in 2019, with a tentative target of reducing PM2.5 and PM10 concentrations by 20-30% by 2024. This target was later revised to 40% by 2026. The government is also working with organisations like the Clean Air Fund to improve air quality data, monitoring, and source apportionment, as well as facilitating dialogue between various stakeholders. Businesses are also playing a role, with the Confederation of Indian Industry developing a Corporate Air Emissions Reporting Guide to help manage and report emissions.
Despite these efforts, India's pollution levels remain a significant concern, and the country continues to grapple with the challenge of reducing air pollution to protect the health and well-being of its citizens.
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EU's fossil fuel reliance
The countries that emit the most carbon dioxide (CO2) are the most industrialised countries, with China, the United States, and India being the top three emitters. Other countries that produce high CO2 emissions include Japan and Russia. The heavy reliance on fossil fuels, particularly coal, is a significant contributor to these countries' high pollution levels.
The European Union (EU) is also a significant contributor to pollution due to its industrial revolution period and heavy reliance on fossil fuels. In 2022, the EU's reliance on fossil fuels for its overall energy supply stood at 70.9%, a slight increase from 69.9% in 2021. This percentage has decreased significantly over the last few decades, with an 11.5 percentage point drop since 1990, mainly due to the increase in renewable energy sources.
The EU's prosperity and security depend on a stable and affordable energy supply. While the EU has made significant strides in recent years towards renewable energy sources, it still has a long way to go in reducing its dependence on fossil fuels. The invasion of Ukraine by Russia has prompted strategic EU policy changes, with the REPowerEU plan outlining measures to reduce Russian gas imports and increase the production of green energy in the EU.
The growth of wind and solar energy sources has played a crucial role in reducing the EU's reliance on fossil fuels. Between 2019 and 2024, the EU avoided importing approximately 92 billion cubic meters of gas and 55 million tonnes of hard coal, according to Ember. This increase in renewable energy sources has also helped to drive down the use of fossil fuels and related CO2 emissions in the EU.
Despite these efforts, the EU still faces challenges in reducing its fossil fuel reliance. In 2024, Russia still accounted for 14% of total gas consumption in the EU, although this was a significant decrease from 50% in 2019. The EU's electricity sector has undergone a deep transformation, with a surge in renewables driving down the use of fossil fuels. By the end of 2024, fossil fuels provided only 29% of the EU's electricity, while renewables accounted for nearly half.
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Arabian Peninsula's oil industry
The three most polluting countries per capita are located in the Arabian Peninsula. This is due to two main factors: the large share of the oil industry in their economies, and their small populations.
Saudi Arabia, the United Arab Emirates, Kuwait, Qatar, Bahrain, and Oman are the six countries in the Arabian Peninsula that are facing air pollution. Dust storms during spring and summer contribute to air pollution by loading large amounts of dust particles in the atmosphere, affecting human activities and reducing visibility.
Unprecedented infrastructure activities, overuse of government-subsidized energy, water desalination plants, heavy traffic in large cities, and industrial plants are largely contributing to anthropogenic aerosol emissions in the Gulf Cooperation Council region. Dust and aerosol particle deposition affect the marine environment and phytoplankton growth in the Arabian Gulf and the Sea of Oman.
The oil industry in Saudi Arabia subsidizes energy use and magnifies carbon dioxide emissions. The country has also contributed to the world's most severe oil spill, the 1991 Gulf War Oil Spill, which directly affected the Saudi Arabian shoreline. The environmental impacts from oil spills are long-lasting and often irreversible. The Kingdom is implementing a plan to restore the coast from oil pollution.
The United States, China, India, Russia, and Japan are the top five countries that produce the highest carbon dioxide emissions.
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Frequently asked questions
The three countries with the highest carbon dioxide (CO2) emissions are China, the United States, and India.
Germany is the European country with the highest CO2 emissions, contributing to over 25% of the entire European Union's CO2 emissions.
The three most polluting countries per capita are located in the Arabian Peninsula. This is due to the large share of the oil industry in their economies and their small populations.
The primary source of CO2 emissions in China is fossil fuels, most notably coal. About 58% of the total energy generated by China comes from coal, and because coal is rich in carbon, burning it releases large amounts of CO2 into the atmosphere.
