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A 'green wall' in the Kubuqi desert

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November 20, 2013 7:58 PM EST Desertification poses major environmental and ecological threats to about one-third of the Earth, according to a 2004 United Nations study. China hopes to stop the spread of the Kubuqi desert by growing a great wall of trees. (Chris Gelken/Shirley Han Ying/Ridealist/Future Forest)

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