Figure 23.21 Predicted changes in global temperatures. Depending on whether we assume (a) low or (b) high increases in CO2 in future years, the temperature is predicted to change. The changes in temperature are relative to the mean temperature observed from 1961 to 1990.
Data from G. A. Meehl et al., Global climate projections. In Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, ed. S. Solomon, et al. (Cambridge University Press, 2007).