Scenario | Key assumption | CO2 concentration | ||
2011-2030 | 2046-2065 | 2081-2100 | ||
B1 (“low” GHG emission scenario”) | Population convergence throughout the world, change in economic structure (pollutant reduction and introduction to clean technology resources). | 410 | 492 | 538 |
A1B (“medium” GHG emission scenario) | Rapid economic growth, maximum population growth during half century and after that decreasing trend, rapid modern and effective technology growth. | 418 | 541 | 674 |
A2 (“high” GHG emission scenario) | Rapid world population growth, heterogeneous economics in direction of regional conditions throughout the world. | 414 | 545 | 754 |