There’s strong evidence that cattle and dogs were domesticated in the Sahara during its most recent greening, and that the most recent desertification was the impetus behind the urbanisation of the Nile valley.
I’ve thought that the rapidity of the most recent desertification, which may have unfolded in less than a century, might have been the basis of the story of the expulsion from the garden of Eden, with its missing rivers and cherubim with swords of fire.
In Herodotus’ time (2500 years ago), Lake Tritonis remained, greatly shrunk, and existing mostly as marshes.
Also, I believe that the USA or at least interests in the USA should as quickly as possible buy up rights to the Sahara Desert. If there was vast vegetation there most likely there is oil beneath those sands today. Also, underground rivers that if tapped into could turn parts of the desert into a vast garden again. Look at what Israel did with it's forsaken land. I believe produce will be and is becoming true wealth in todays world of shortages.