Figure SPM-7: Stabilizing CO₂ concentrations would lessen warming but by an uncertain amount. Temperature changes compared to year 1990 in (a) year 2100 and (b) at equilibrium are estimated using a simple climate model for the WRE profiles as in Figure SPM-6. The lowest and highest estimates for each stabilization level assume a climate sensitivity of 1.7 and 4.2°C, respectively. The center line is an average of the lowest and highest estimates.