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The Discovery of Global Warming                     June 2010

The Pasterze Glacier in Austria in 1875 and 2004. Like nine-tenths of the glaciers around the world, it has been retreating; the rock exposed has not seen daylight for thousands of years. (For more pictures of global warming effects see Gary Braasch's photos.)

Left: Courtesy H. Slupetzky / University of Salzburg; Right: Copyright � 2004 Gary Braasch, reproduced by permission.
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Copyright © 2005 Spencer Weart & American Institute of Physics