The Sahara is known as one of the world’s hottest and driest environments, but during his explorations of the desert over the past 60 years, Martin Williams has discovered evidence of a green and pleasant history. He explains to Spencer Mizen how the area was once home to lakes, rivers, humans and hippos. (Ad) Martin Williams is the author of When the Sahara Was Green: How Our Greatest Desert Came to Be (Princeton University Press, 2021). Buy it now from Amazon:https://www.amazon.co.uk/When-Sahara-Was-Green-Greatest/dp/0691201625/?tag=bbchistory045-21&ascsubtag=historyextra-social-histbotyOn the streets of 19th-century London See acast.com/privacy for privacy and opt-out information.