Ponds surrounded by land with few shrubs on left; same ponds surrounded by more shrubs on right.

This satellite view of a site on the Siberian tundra near Russia's Yenisey River in 1966 (left) shows much more open tundra than a view of the same area in 2009 (right).

Image Credits: Left: Gambit image courtesy the U.S. Geological Survey. Right: GeoEye-1 image copyright GeoEye, Inc., provided through the NGA Commercial Imagery Program.

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Last modified
3 January 2017 - 4:34pm