| No. | Departure Country | TOTAL PASSENGER OPERATIONS | |
| CO2 [MMT] | % Global Total | ||
| 1 | United Statesa | 181.91 | 24.36% |
| 2 | European Unionb | 141.74 | 18.98% |
| 3 | Chinac | 94.91 | 12.71% |
| 4 | United Kingdom | 29.85 | 4.00% |
| 5 | Japan | 23.42 | 3.14% |
| 6 | Germany | 22.17 | 2.97% |
| 7 | India | 19.38 | 2.59% |
| 8 | United Arab Emirates | 21.14 | 2.83% |
| 9 | Spain | 18.52 | 2.48% |
| 10 | Australia | 19.00 | 2.54% |
| 11 | France | 19.15 | 2.56% |
| 12 | Canada | 17.16 | 2.30% |
| 13 | Russian Federation | 16.28 | 2.18% |
| 14 | Brazil | 14.81 | 1.98% |
| 15 | Thailand | 13.07 | 1.75% |
| 16 | Indonesia | 13.89 | 1.86% |
| 17 | Turkey | 11.93 | 1.60% |
| 18 | Italy | 11.89 | 1.59% |
| 19 | Republic of Korea | 12.17 | 1.63% |
| 20 | Mexico | 11.18 | 1.50% |