That is an oversimplification of an existing theory, it is not proven: https://www.smithsonianmag.com/science-nature/what-really-turned-sahara-desert-green-oasi

That is an oversimplification of an existing theory, it is not proven: https://www.smithsonianmag.com/science-nature/what-really-turned-sahara-desert-green-oasis-wasteland-180962668/ https://www.smithsonianmag.com/science-nature/what-really-tu.... Note: "It’s important to note that the green Sahara always would’ve turned back into a desert even without humans doing anything—that’s just how Earth’s orbit works, says geologist Jessica Tierney, an associate professor of geoscience at the University of Arizona. Moreover, according to Tierney, we don’t necessarily need humans to explain the abruptness of the transition from green to desert."