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Saw a fascinating documentary last night on the Sahara.
It is also interesting to note that the Sahara is currently a desert because of cooler temps.

In the southern Sahara though, the drying trend was soon counteracted by the monsoon, which brought rain further north than it does today. The monsoon season is caused by heating of air over the land during summer. The hot air rises and pulls in cool, wet air from the ocean, which causes rain. Thus, though it seems counterintuitive, the Sahara was wetter when it received more insolation in the summer.
http://en.wikipedia.org/wiki/Sahara#Climate
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