It obviously doesn't cover the why of Sahara's greening, but for anyone who has access to BBC iPlayer, the following programme [1] has a nice summary of humanit

It obviously doesn't cover the why of Sahara's greening, but for anyone who has access to BBC iPlayer, the following programme [1] has a nice summary of humanity's journey out of Africa. It's amazing that the majority of the world's population is descended from the couple of hundred individuals that left during one of these greening periods. [1] https://www.bbc.co.uk/iplayer/episode/b00kfqps/the-incredible-human-journey-1-out-of-africa https://www.bbc.co.uk/iplayer/episode/b00kfqps/the-incredibl...