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
Trenberth/IPCCConstant
2000 CO2
Emissions
High
Medium
Low
Predictions
of increased CO2 &
Temperature