Based on percentage of GDP in 2010
| Nation | Percentage |
| 1) China: | 12% |
| 2) Russia: | 7.9% |
| 3) India: | 6.1% |
| 4) Germany: | 5.8% |
| 5) South Korea: | 5.2% |
| 6) Iran: | 4.8% |
| 7) Unites Arab Emirates: | 4.2% |
| 8) Saudi Arabia: | 3.8% |
| 9) Unites States: | 3.7% |
| 10) Indonesia: | 3.3% |
Sources: Global Commission on the Economy and Climate & Financial Times, September 24, 2014.
Photo by kevin dooley