NASA has made a this striking animation that shows a 130-year history of how global temperatures have become warmer in most parts of the world. The polar regions are warming fastest and quickest as is clearly shown. Here’s the temperature scale and more detailed explanation from NASA follows. — Stephen
Source: NASA/Goddard Space Flight Center Scientific Visualization Studio
Five-Year Average Global Temperature Anomalies from 1880 to 2010
This analysis concerns only temperature anomalies, not absolute temperature. Temperature anomalies are computed relative to the base period 1951-1980. The reason to work with anomalies, rather than absolute temperature is that absolute temperature varies markedly in short distances, while monthly or annual temperature anomalies are representative of a much larger region. Indeed, we have shown (Hansen and Lebedeff, 1987) that temperature anomalies are strongly correlated out to distances of the order of 1000 km
This color-coded map displays a progression of changing global surface temperatures anomalies from 1880 through 2010. The final frame represents global temperature anomalies averaged from 2006 to 2010.