The Sahara Desert was once filled with rivers, giant lakes and hippos. Scientists explain why it turns green every 20,000 years
Why the Sahara turns green every 20,000 years How plants help keep the Sahara green for thousands of years “ ”, The evidence stretches back
Why the Sahara turns green every 20,000 years How plants help keep the Sahara green for thousands of years “ ”, The evidence stretches back millions of years The last Green Sahara was far from a rainforest Hippos and crocodiles were part of everyday life The next Green Sahara is not something that can be dated
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