There is widespread evidence that the Sahara was periodically vegetated in the past, with the proliferation of rivers, lakes and water-dependent animals such as hippos. Changes of vegetation between humid and arid phases in North Africa. Vegetation zones are based on the minimum precipitation requirements of each vegetation type. Jani Närhi / University of Helsinki A pioneering study has shed new light on North African humid periods that have occurred over the past 800,000 years and explains why the Sahara Desert was periodically green.

https://www.miragenews.com/why-and-when-sahara-desert-was-green-1083701/

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