The most striking environmental shift on the planet in the Holocene epoch was the greening of the Sahara. For thousands of years, the now-deserts of northern Africa were a mosaic of savannahs, river valleys, and shallow lakes. This unique environment produced the ways of life that eventually brought pastoralism and food production, as well as a variety of language families and populations, to the furthest corners of the continent.

Patrick's book is now available! Get The Verge: Reformation, Renaissance, and Forty Years that Shook the World in hardcopy, ebook, or audiobook (read by Patrick) here: https://bit.ly/PWverge 

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