NASA produced a video of the yearly average temperature map from the 1880's to 2011. The 1930's and 1940's were a warm period and the 1990s to the present were also even warmer. It is very good visual representation of the temperature changes at different spots in the world. The colors match a scale often used in infrared photography. It would be interesting to do a similar reconstruction of the past 2,000 years averaging out each decade.
Richard Muller from UC Berkley has two physics books on the topic with one on the physics of climate change published in 2012.
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