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