Original: Burroughs, William J. (2007) "Climate Change in Prehistory: the end of the reign of chaos" (Cambridge University Press) Human migration The Saharan pump has been used to date four waves of human migration from Africa, namely: Homo erectus (ssp.
Simplified: Burroughs, William J. (2007) "Climate Change in Prehistory: the end of the reign of chaos" (Cambridge University Press) During these periods of a wet Sahara, the Sahara and Arabia become a savanna grassland and African flora and fauna become common. The Saharan pump has been used to date four waves of human emigration from Africa, namely: Homo erectus (ssp.