According to a new survey, China releases more greenhouse gas than the entire developed world combined.
The Rhodium Group, a US-based think tank, in its report said China released 27% of global greenhouse gas emissions in 2019, reports BBC.
According to the think tank, the United States was the second-largest emitter with 11 percent of emissions, followed by India with 6.6 percent.
Scientists warn that avoiding dangerous climate change would be difficult without a deal between the US and China.
According to the study from the Rhodium Group, China's emissions have more than tripled in the last three decades.
Since the Asian giant has the world's largest population, its per capita emissions are still well behind those of the United States, but the study found that those emissions have risen as well, tripling in the last two decades.
China has pledged to achieve net-zero emissions by 2060, with a peak by 2030.
Last month, President Xi Jinping reaffirmed his commitment at a climate summit hosted by US Vice President Joe Biden.
"This major strategic decision is made based on our sense of responsibility to build a community with a shared future for mankind and our own need to secure sustainable development," President Xi said at the time.
However, China is heavily reliant on coal power.
The country is currently running 1,058 coal plants - more than half the world's capacity.