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China was the biggest emitter of carbon dioxide (CO₂) emissions in 2024, accounting for over ** percent of total global emissions. The world's top four largest polluters were responsible for almost ** percent of global CO₂ emissions in 2024. 

Cumulative emissions

Although China currently emits the highest levels of CO₂ annually, it has emitted far less than the United States over the past three centuries. Since 1750, the United States has produced more than *** billion metric tons of cumulative carbon dioxide emissions. Global CO₂ emissions have increased dramatically since the birth of the Industrial Revolution, and in 2024 reached a record high. 

Which countries are reducing emissions?

As of 2024, seven of the 20 biggest COâ‚‚ emitters had recorded overall emissions reductions when compared to 1990 levels. The United Kingdom, for example, slashed its carbon emissions by almost ** percent between 1990 and 2024, while Germany recorded reductions of roughly ** percent. In comparison, many developing countries saw their emissions increase massively over the same period.