Helena Joyce
The largest contributors to global warming pollution are China, the United States, India, and the European Union. These countries were responsible for 83% of emissions in 2022. While China is currently the largest emitter of greenhouse gases, the United States has emitted the largest share of carbon dioxide since 1850. Per capita emissions in China are significantly lower than in the United States, where emissions are nearly twice the global average. India, despite being one of the world's biggest polluters, also has per capita emissions below the global average. The world is currently on a path towards 3 degrees of global warming, despite international climate action and agreements such as the Paris Agreement, which aim to keep warming below 2 degrees Celsius.
| Characteristics | Values |
|---|---|
| Largest source of global warming pollution in 2022 | China |
| Largest source of global warming pollution historically | United States |
| Top 3 sources of global warming pollution | China, India, United States |
| Country with highest per capita emissions | United States |
| Number of countries responsible for 83% of emissions in 2022 | 20 |
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What You'll Learn
China's emissions
China's per capita emissions are higher than the global average, and its citizens' carbon footprints are well above the global average. However, when compared to the United States, China's per capita emissions are about half. China's cumulative CO2 emissions since 1850 are also lower than those of the US, which has emitted over 509 GtCO2 during that period. China's emissions have significant implications for global energy markets and carbon dioxide emissions.
China has recognized the importance of addressing climate change, with the ruling Communist Party of China (CPC) and the Chinese government making it a priority. In 2020, Chinese leader Xi Jinping pledged to "peak carbon dioxide emissions before 2030" and "achieve carbon neutrality before 2060." China has committed to reducing its reliance on coal, with plans to phase down coal use from 2026.
China is also a leader in the deployment and manufacture of low-carbon technologies, and it has the world's largest capacity for renewables and hydroelectricity. However, temporary slowdowns in manufacturing and construction, such as during the 2019-20 coronavirus outbreak, have only resulted in minor reductions in China's emissions. Nonetheless, China's emissions trajectory remains crucial in the global effort to avoid the worst impacts of climate change.
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US historical emissions
The United States has emitted more CO2 than any other country, with around 400 billion tonnes since 1751, accounting for about a quarter of historical emissions. By the end of 2021, the US had emitted over 509 GtCO2 since 1850, with a 20% share of the global total. This is associated with about 0.2C of warming to date.
The US's historical emissions are largely due to its industrial revolution and heavy reliance on fossil fuels. By 1800, the US had emitted 250,000 metric tons of CO2, but as the Industrial Revolution took hold, its economy shifted from agriculture to industry, and emissions soared. The US has been the largest contributor to global warming pollution over time, even though China was the biggest polluter in 2022.
The EPA has prepared the Inventory of US Greenhouse Gas Emissions and Sinks since the early 1990s, which provides an annual accounting of total greenhouse gas emissions from all man-made sources in the US. This includes carbon dioxide, methane, nitrous oxide, and other gases. In 2022, US greenhouse gas emissions totalled 6,343 million metric tons of carbon dioxide equivalents, a 1% increase from the previous year, driven largely by an increase in CO2 emissions from fossil fuel combustion.
The US has recognized its historical responsibility for climate change and has taken steps to address it. The Inflation Act, for example, includes provisions for clean energy investments, tax credits for renewable projects, and initiatives to accelerate the transition to a low-carbon economy.
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India's emissions
India is one of the world's biggest climate polluters, with its emissions being responsible for contributing to global warming. While per capita emissions in India are significantly below the global average, the country's large population means that annual emissions figures are often used to compare its contribution to climate change. India's emissions are primarily driven by the burning of fossil fuels, with the energy sector being responsible for the majority of greenhouse gas emissions.
India's energy-related CO2 emissions are influenced by the structure of its economy and energy system. For example, India's emissions are impacted by the share of energy-intensive industries, such as steel or chemicals, and its dependence on fossil fuels for power generation. Fossil fuel heating is also the predominant source of residential emissions in the country. Additionally, industrial emissions arise from burning fossil fuels to generate heat for processes such as paper or steel production.
India has set targets and policies to address its climate impact, but these have been rated as "Highly Insufficient" by the Climate Action Tracker (CAT). India's targets are not consistent with the Paris Agreement's 1.5°C temperature limit. The country has a 50% non-fossil capacity target by 2030, which is conditional on international support. However, this target has been deemed highly insufficient compared to a modelled 1.5°C emissions pathway. India also plans to transition to 100% electric vehicles (EVs), particularly two and three-wheelers, with all new two-wheelers being electric by 2026.
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EU emissions
The European Union is one of the world's top climate polluters, responsible for 83% of emissions in 2022. The EU has implemented several initiatives to address its carbon emissions and combat climate change. One significant initiative is the EU Emissions Trading System (EU ETS), which was established in 2005 and is currently in its fourth phase (2021-2030). The EU ETS is based on a “cap and trade” principle, where a limit is set on the total amount of greenhouse gas emissions allowed for installations and operators within its scope. This cap is reduced annually, in alignment with the EU's climate targets, ensuring a decrease in overall EU emissions over time. By 2023, the EU ETS had contributed to a 47% reduction in emissions from European power and industry plants compared to 2005 levels.
The EU ETS functions through a system of emission allowances, which are sold in auctions or traded among companies. Each allowance grants the right to emit one tonne of carbon dioxide equivalent (CO2 eq). Companies must monitor and report their emissions annually and surrender enough allowances to cover their emissions. The declining cap and associated scarcity of allowances incentivize companies to reduce emissions cost-effectively. The EU ETS has raised over EUR 175 billion since 2013, with revenues primarily directed towards supporting investments in renewable energy and energy efficiency improvements.
In addition to the EU ETS, the European Union has adopted other measures to address climate change. The Carbon Border Adjustment Mechanism (CBAM) aims to prevent carbon leakage by placing a carbon price on imported goods based on their carbon content. The EU has also reformed the rules for monitoring, reporting, and verifying emissions from maritime transport and aviation. Furthermore, the Social Climate Fund was established to complement the new emissions trading system for buildings, road transport, and small emitting industries. The EU has committed to becoming climate-neutral by 2050 and aims to reduce its net emissions by at least 55% by 2030 compared to 1990 levels.
While the EU has made significant progress, it is not fully on track to meet its 2030 emission reduction targets. The proposed 2040 target is a net 90% reduction in emissions, which is considered insufficient by the European Scientific Advisory Board on Climate Change (ESABCC). The EU has recognized the importance of scaling up international climate finance and increasing its financial support for developing countries. The European Green Deal has resulted in key proposals, such as revisions to the Energy Performance in Buildings Directive and the Methane Regulation, which aim to improve energy efficiency and move away from fossil fuels.
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Wealthy nations' responsibility
While China was the largest climate polluter in 2022, accounting for nearly 30% of global emissions, the United States has emitted the largest share of emissions over time. The US is responsible for 20.3% of the global total of carbon emissions since 1850, which is associated with 0.2C of warming to date.
Wealthy nations have historically built their economies on the burning of fossil fuels, and as a result, bear a greater historical responsibility for climate change. The richest 1% of the global population by income are responsible for more carbon emissions than 5 billion people, or 66% of the world's population. The carbon emissions of the super-rich globally were more than double the emissions of the poorest 50% of humanity from 1990 to 2015.
Wealthy nations have a responsibility to reduce emissions and support developing countries in their transition to cleaner energy sources. Wealthy polluters, including large corporations, have recklessly extracted fossil fuels for energy production and contributed significantly to global climate change. Big Oil, for example, has been accused of doubling down on its polluting activities, enabling the release of large amounts of carbon dioxide and methane into the Earth's atmosphere.
At the COP28 climate summit in Dubai in December, countries pledged over $700 million to help nations hit hardest by the climate crisis. However, wealthy nations have historically resisted calls for specific funding mechanisms for loss and damage, fearing liability claims. The concept of fairness in climate action has long been a tense topic, with many in the Global South arguing that wealthy countries have a responsibility to slash emissions faster and reach net-zero goals sooner.
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Frequently asked questions
China is the largest emitter of greenhouse gases today, driven by its extensive use of coal and rapid economic growth.
The United States is responsible for the largest share of historical emissions, with some sources stating that the US has emitted over 20% of the global total since 1850.
The top sources of global warming pollution are China, the United States, India, and the European Union.
While some rapidly developing countries are now among the world's largest polluters, their total emissions and emissions per capita are often lower than those of wealthier nations.
