| Region | 1990 | 2015 | 2050 |
| Africa | 70 | 55 | 45 |
| Asia & Pacific | 60 | 50 | 55 |
| Europe & former USSR | 75 | 75 | 70 |
| Latin America & Caribbean | 70 | 65 | 60 |
| North America | 80 | 80 | 80 |
| West Asia | 90 | 75 | 70 |
| World | 70 | 65 | 60 |
Source:
RIVM/UNEP (1997).
Note:
Totals are rounded to 5 per cent intervals.