| Nation | CO2 reduction pledge/ | Number of gigantic solar plants needed (Ouarzazate) | Gigantic plants needed for 40% reduction |
| % of 2005 emissions | |||
| United States | 26 - 28i | 2100 | 3200 |
| China | noneii | 0 | 3300 |
| EU28 | 41 - 42 | 2300 | 2300 |
| India | noneii | 0 | 600 |
| Japan | 26 | 460 | 700 |
| Brazil | 43 | 180 | 170 |
| Indonesia | 29 | 120 | 170 |
| Canada | 30 | 230 | 300 |
| Mexico | 25 | 120 | 200 |
| Australia | 26 - 28 | 130 | 190 |
| Russia | noneiii | 0 | 940 |
| Canada | 30 | 230 | 300 |
| Mexico | 25 | 120 | 200 |
| Iran | 4 - 12iv | 22 | 220 |
| Saudi Arabia | noneii | 0 | 150 |
| Turkey | 21 | 60 | 120 |
| Thailand | 20 - 25iv | 50 | 110 |
| Germany | 49iv | 550 | 450 |
| Italy | 35v | 230 | 270 |
| France | 37v | 210 | 220 |
| World | N/A | N/A | 16,000 |