China accounts for about one third of all global CO2 emissions.

Omissions

• The one-third figure refers to fossil-fuel and industrial CO2 emissions; when land-use change emissions are included, China's share of total CO2 emissions is somewhat lower (around 29–30%).
• China's share is rising over time (from roughly 25–28% a decade ago to about 32% now), so the figure is period-dependent, but both the 2024 reference year and the 2025 projection converge on about one third.
• The most recent data available before the session date are the 2024 reference-year estimates from the Global Carbon Budget 2025 (with a 2025 projection), so the share is verified for 2024–2025 rather than for 2026 itself.

Sources

• AcademicGlobal Carbon Budget 2025 (Earth System Science Data, Global Carbon Project)"In 2024, the largest absolute contributions to global fossil CO2 emissions were from China (32 %), the USA (13 %), India (8 %), and the EU27 (6 %)."
• SecondaryCarbon Brief — Analysis: Fossil-fuel CO2 emissions to set new record in 2025"China represents 32% of global CO2 emissions today. Its 2025 emissions are projected to increase by a relatively small 0.4%..."
• SecondaryOur World in Data — China CO2 and Greenhouse Gas Emissions country profile"China emitted 31.84% of the world's CO2 emissions in 2024."