Thursday, 26 April 2012

The Changing Face of Planet Earth

The retreat of Pedersen Glacier in Alaska. Left: summer 1917. Right: summer 2005. Credit: 1917 photo captured by Louis H. Pedersen; 2005 photo taken by Bruce F. Molnia. Source: The Glacier Photograph Collection, National Snow and Ice Data Center / World Data Center for Glaciology.
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