Monsoon deluges turned ancient Sahara green

Leaf-wax measurements used to reconstruct 25,000 years of rainfall

Sahara desert

RAIN OUT  Rainier conditions than previously thought turned the Sahara Desert into grasslands, lakes and rivers from 11,000 to 5,000 years ago, a new study finds. A brief return to aridity around 8,000 years ago set the stage for cattle herders to spread across North Africa, researchers suspect.

Dimity B./Flickr (CC BY 2.0)

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