The Sahara Desert was created by humans 5000 years ago

As recently as 5,000 years ago, the Sahara was not a desert, but green. Dramatic changes can arise from even gradual planetary shifts. First the change comes slowly, then fast, in just a few hundred years.

This is some high quality twitter content in this thread: https://t.co/TMy3pxXApj

— Nicholas A. Christakis (@NAChristakis) September 2, 2019