Figure 15.22Surface temperature anomalies for the years 1912 (top), 1962 (middle), and 2012 (bottom) measured relative to the mean local temperatures for the baseline period 1951–1980. The globally averaged difference between 1912 and 2012 is about 0.8°C, consistent with the twentieth century warming (see Figure 15.20). In the arctic region, the warming has been several times higher than this mean value, whereas in the central Pacific Ocean, it has been very small.