- United States: 150 GtCO2 (25% of global emissions)

- China: 115 GtCO2 (19%)

- Russia: 81 GtCO2 (13%)

- Germany: 79 GtCO2 (13%)

- United Kingdom: 63 GtCO2 (10%)

- Japan: 55 GtCO2 (9%)

- India: 53 GtCO2 (9%)

- France: 45 GtCO2 (7%)

- Canada: 44 GtCO2 (7%)

- Italy: 42 GtCO2 (7%)

It's important to note that historical emissions are only part of the picture. Current and projected emissions matter just as much for mitigating climate change. China is currently the world's largest emitter of CO2, and its emissions continue to grow rapidly. The US, while still a major emitter, has made progress in reducing its emissions in recent years.