Multi-model global averages of surface warming (relative to 1980-99) for the scenarios A2, A1B and B1,
as continuations of the 20th century simulations. Shading is plus/minus
one standard deviation range of individual model annual averages. Trenberth/IPCC
Constant 2000 CO2
Emissions
High
Medium
Low
Predictions of increased CO2 & Temperature