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The Sahara Desert Used To Be a Green Savannah and New Research Explains Why

We identified why North Africa greened approximately every 21,000 years over the past eight million years. It was caused by changes in the Earth’s orbital precession – the slight wobbling of the planet while rotating. This moves the Northern Hemisphere closer to the sun during the summer months.

from The Wire Science https://ift.tt/0jPJlBH
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