Box 6.1, Figure 1. (Left) December to February (top), annual mean (middle) and June to August (bottom) latitudinal distribution of present-day (year 1950) incoming mean solar radiation (W m^–2). (Right) Deviations with respect to the present of December to February (top), annual mean (middle) and June to August (bottom) latitudinal distribution of incoming mean solar radiation (W m^–2) from the past 500 kyr to the future 100 kyr (Berger and Loutre, 1991; Loutre et al., 2004).