Great Drying
Description
Barry Rodriguez:
"Then another period of aridification began 8000 years ago—the Great Drying. In North Africa, wetlands evaporated as grazing herds compounded the climate problem. Prairies degraded into Sahara dunes. Some adapted to desert life, such as the Bedouin, but others relocated to new areas of water: the Mediterranean, Lake Chad, and the Niger and Nile rivers."
(https://jbh.journals.villanova.edu/index.php/JBH/article/view/2721/2582)