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Is Earth Turning Into A Big Desert?

Thousands of years ago the Sahara looked nothing like it does today. How is climate change altering the world’s deserts?
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Read More:
Deserts Might Grow as Tropics Expand
http://www.livescience.com/10472-deserts-grow-tropics-expand.html
“Rivers of air that move both storms and airplanes around the planet have been creeping poleward over the past 26 years. The migration of these so-called “jet streams” has widened the planet’s tropical belt and could expand dry regions around the world in coming decades, a new study reports.”

Deserts set to expand
http://www.nature.com/news/2005/050616/full/news050613-7.html#B1
“Many of the world’s dry regions, currently home to some 2.1 billion people, are in danger of becoming useless for growing food, according to the latest in a series of reports on the world’s ecosystems. It blames climate change and human activities.”

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