A new study shows that the Sahara Desert changes from barren savannah to lush green woodland every 21,000 years or so.
It wasn’t just an odd blip, though–this shift is part of a cyclic transformation that has changed the area from arid to humid roughly every seven thousand years.
This cycle takes place due to shifts in Earth’s orbit around the sun.
The new study looks at this cycle using a climate model and simulates it using a recently developed climate model.
They suggest that this cycle might be influenced by the distant high-latitude ice sheets in the Northern Hemisphere.
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