The countries that emit the most greenhouse gas

China produces more greenhouse gas emissions than any other country, followed by the United States, India, Russia, and Japan. These five nations account for roughly half of global emissions. However, the ranking changes depending on whether you measure total emissions from a country or emissions per person living there—and that difference matters for understanding who is responsible for climate change and who bears the cost of fixing it.

Total emissions tell you which countries are driving climate change right now. Per-capita emissions tell you which countries are using the most resources per person. A country with a large population can have high total emissions but low per-capita emissions if most of its people live straightforward. A small wealthy country can have low total emissions but very high per-capita emissions because each person consumes a lot.

Key Takeaways

  • China, the United States, India, Russia, and Japan emit roughly half of the world's greenhouse gases when measured by total output.
  • Per-capita emissions—the amount each person produces—are highest in oil-rich nations and wealthy countries, not necessarily the countries with the highest totals.
  • Emissions come from burning fossil fuels for electricity, heat, and transportation; from agriculture and livestock; and from industrial processes like cement and steel production.
  • A country's emissions footprint includes both what it produces domestically and what it produces for goods other countries import.

How emissions are measured and why the numbers vary

Greenhouse gas emissions are usually measured in gigatons of carbon dioxide equivalent (CO₂e) per year. This unit lets you compare different gases—methane, nitrous oxide, and others—by converting them all to the warming effect of carbon dioxide. Different organizations publish slightly different totals because they use different data sources, include or exclude certain sectors, and measure different time periods.

The most widely cited figures come from the Global Carbon Project, which tracks emissions from fossil fuels and industry, and from the International Energy Agency (IEA), which focuses on energy-related emissions. National governments also report their own figures to the United Nations Framework Convention on Climate Change (UNFCCC), though these reports lag by a year or two and some countries report more accurately than others.

When you see a country's emissions number, check whether it includes only energy and industry or also agriculture, waste, and land use. Agriculture and land use can be significant—they account for roughly a quarter of global emissions—but not all sources report them the same way.

Why China and the United States lead in total emissions

China's total emissions are roughly double those of the United States, but for different reasons. China manufactures goods for the world—cement, steel, electronics, textiles—and manufacturing is energy-intensive. Much of China's electricity still comes from coal. The country also has over 1.4 billion people, so even moderate per-capita emissions add up to a large total.

The United States has lower total emissions than China but higher per-capita emissions. Americans use more energy per person for transportation, heating and cooling, and consumption of goods. The U.S. economy is also less manufacturing-focused than China's; many goods Americans buy are made elsewhere and counted in other countries' emissions.

India ranks third in total emissions but has very low per-capita emissions because most of its 1.4 billion people use little energy. As India's economy grows and more people gain access to electricity and vehicles, its total emissions are rising faster than any other large country's.

Per-capita emissions: who uses the most energy per person

When you divide total emissions by population, the ranking shifts dramatically. Qatar, Bahrain, Kuwait, and the United Arab Emirates have the highest per-capita emissions in the world—often 10 to 15 times higher than the global average. These are oil and gas-producing nations where energy is cheap and abundant, and where wealth is concentrated. Australia, Saudi Arabia, the United States, and Canada also rank in the top 10 for per-capita emissions.

Most African and South Asian countries have very low per-capita emissions because most people there use little electricity, drive rarely, and eat less meat. As these regions develop and incomes rise, per-capita emissions typically increase—which is why India and other developing nations argue that wealthy countries should cut their emissions faster, since wealthy people have already benefited from decades of high-emission living.

Per-capita emissions matter because they show consumption patterns and lifestyle. They also matter politically: countries often argue about whether responsibility should be based on total emissions (which favors large wealthy nations) or per-capita emissions (which favors large poor nations).

What sectors produce the most emissions

Electricity and heat generation account for roughly 25 percent of global emissions. Most of this comes from burning coal, natural gas, and oil in power plants. Transportation—cars, trucks, ships, and planes—accounts for about 14 percent. Manufacturing and construction account for roughly 21 percent. Agriculture, forestry, and land use account for about 24 percent, mostly from livestock farming and fertilizer use. The remaining 16 percent comes from buildings (heating and cooling), waste, and other sources.

The mix varies by country. China's emissions are heavily weighted toward manufacturing and electricity. The United States has a larger share from transportation and buildings. India has a larger share from agriculture. Oil-producing countries have large shares from energy production itself.

Understanding the sector breakdown matters because it shows where a country could cut emissions most effectively. A country with high transportation emissions might focus on electric vehicles and public transit. A country with high agricultural emissions might focus on farming practices and diet. A country with high manufacturing emissions might shift to cleaner energy sources or move manufacturing elsewhere—which can reduce its reported emissions while increasing global emissions if the manufacturing straightforward moves to a dirtier country.

Emissions from manufacturing goods for export

A country's reported emissions include everything produced within its borders, regardless of who buys it. This means China's emissions include the coal burned to make goods that are shipped to the United States and Europe. The United States' reported emissions do not include the emissions from manufacturing those imported goods.

Some analysts calculate "consumption-based emissions"—the emissions from everything a country's people and businesses consume, including imported goods. By this measure, the United States and Europe have higher emissions than their reported figures show, because they outsource manufacturing to other countries. China's consumption-based emissions are lower than its production-based emissions because it exports more than it imports.

This distinction matters for climate responsibility. If you believe countries should be responsible for the emissions of goods they consume, the ranking changes. If you believe countries should be responsible only for what they produce, the ranking stays as reported. Most climate agreements use production-based emissions, which is why countries have an incentive to move dirty manufacturing abroad.

How emissions have changed over time

Global emissions have risen steadily since the Industrial Revolution, with a few exceptions. Emissions dipped during the 2008 financial crisis and again briefly during the COVID-19 pandemic, but resumed climbing afterward. China's emissions have grown faster than any other major economy over the past 20 years as its manufacturing and energy use expanded. The United States' emissions have been relatively flat or declining slightly in recent years as coal use has fallen and renewable energy has grown.

Developed countries in Europe have managed to reduce emissions while maintaining economic growth, mostly by shifting to renewable electricity, improving building efficiency, and reducing manufacturing. Developing countries have generally seen emissions rise as their economies grow, though some are beginning to add renewable energy faster than fossil fuels.

The trajectory matters because climate change depends on cumulative emissions over time. Wealthy countries have emitted far more total greenhouse gas over the past 150 years, which is why some argue they bear more responsibility for the problem even if their current annual emissions are lower.

Frequently Asked Questions

Does the United States emit more greenhouse gas than China?

No. China's total emissions are roughly double the United States'. However, per person, Americans emit more than Chinese citizens do. China leads in total emissions because of its large population, manufacturing-heavy economy, and reliance on coal for electricity.

Why do some countries report different emission numbers?

Different organizations use different data sources, measure different time periods, and include or exclude sectors like agriculture and land use differently. National governments report to the UN, but these reports lag by a year or two and some countries have better monitoring systems than others.

Are emissions from imported goods counted in a country's total?

No. A country's reported emissions include only what is produced within its borders. If the United States imports steel made in China, the emissions count toward China's total, not the United States'. This is why some analysts track "consumption-based emissions" instead, which assign emissions to the country that buys the goods.

Which country has the lowest emissions per person?

Several African and South Asian countries have the lowest per-capita emissions—often under 1 ton of CO₂e per person per year. Qatar and other oil-rich nations have the highest, often over 10 tons per person. The global average is roughly 4 to 5 tons per person per year.

Do emissions include agriculture and farming?

It depends on the source. Some reports include agriculture, forestry, and land use; others focus only on energy and industry. Agriculture accounts for roughly a quarter of global emissions, mostly from livestock and fertilizer use, so including or excluding it significantly changes a country's total.