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10 places to visit before they vanish

By: Bryan Nelson on Dec. 29, 2009, 11:49 a.m.
Saharan Africa

Photo: John Spooner/Flickr

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Saharan Africa

By some estimates, the Sahara in Africa is growing at a rate of 0.5 miles per month. The desert, already the largest in the world, could consume all of Northern Africa, altering the environment of a continent.