The simplest and most widely cited way to compare the emissions of countries is to add up all the fossil fuels burned in each nation and convert that into CO2. According to 2009 data from the US Energy Information Administration, the top 10 emitters by this measure are:

1. China: 7,711 million tonnes (MT) or 25.4%
2. US: 5,425 MT or 17.8%
3. India: 1,602 MT or 5.3%
4. Russia: 1,572 MT or 5.2%
5. Japan: 1,098 MT or 3.6%
6. Germany: 766 MT 2.5%
7. Canada: 541 MT or 1.8%
8. South Korea: 528 MT or 1.7%
9. Iran: 527 MT or 1.7%
10. UK: 520 MT or 1.7%
See all countries

Source : The Guardian

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