While some ecological disasters are definitely man-made, the Sahara has been mostly the way it is today for the last 10,000 years (source: https://en.wikipedia.

While some ecological disasters are definitely man-made, the Sahara has been mostly the way it is today for the last 10,000 years (source: https://en.wikipedia.org/wiki/Sahara#Desertification_and_prehistoric_climate https://en.wikipedia.org/wiki/Sahara#Desertification_and_pre...). Of course the current climate change will influence whether it will expand in the future, but the "core" Sahara has been there before human influence...