Humans may have transformed the Sahara from lush paradise to barren desert

Once upon a time, the Sahara was green. There were vast lakes. Hippos and giraffe lived there, and large human populations of fishers foraged for food alongside the lakeshores.

The “African Humid Period” or “Green Sahara” was a time between 11,000 and 4,000 years ago when significantly more rain fell across the northern two-thirds of Africa than it does today…

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