| Scenarios |
Hypothesis |
| A1 |
Very rapid economic growth
Global population reaches 9 billion in 2050 then decreases thereafter
Rapid introduction of new and more efficient technologies
A1F1 (massive use of fossil fuels);
A1T (a strong call on non-fossil sources)
A1B (balanced call on various energy sources without heavily relying on one in particular) |
| A2 |
World population reaches 15 billion people in 2100, and rising
Economic growth and spread of new efficient technology changes fragmented and slower
• High emissions at regional level
|
| B1 |
World population reaches 9 billion people in 2050 then decreases
Economy is dominated by services and informational technologies
Addressing economic, social, and environmental problems |
| B2 |
World population reaches more than 10.4 billion people in 2100 and increasing at a slow rate
Intermediate levels of economic development
Development and spread of new technologies uneven and slower than for B1 or A1
Low emissions at regional level |
(Source: SRES, IPCC, 2007)