Fig. 2.

Comparison between calculated time-dependent surface warming in the Bern2.5CC model and the values that would be expected if temperatures were in equilibrium with respect to the CO₂ enhancements, illustrative of 2%/year emission increases to 450, 550, 650, 750, 850, and 1,200 ppmv as in Fig. 1. (Left) The actual and equilibrium temperature changes (based upon the model's climate sensitivity at equilibrium). The cyan lines in Right show the ratio of actual and equilibrium temperatures (or realized fraction of the warming for the time-dependent CO₂ concentrations), while the magenta lines show the ratio of actual warming to the equilibrium temperature for the peak CO₂ concentration.