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Best evidence to date suggests that the Sahara dried up about 5,000 years ago, possibly in as little as 300 years, due to climate changes resulting from the precession and rotation of the Earth's rotation axis. ... around 8,000 years ago, the Earth's orbit was slightly different to how it is today. The tilt changed from around 24.1 degrees to the ...


I have in the past seen claims that human activity, specifically overgrazing by domestic goats and salinification of the water table by repeated irrigation, has been responsible for the advance of the desert into previously habitable areas of North Africa. That's a far cry from your book's reported claim, but its at least a nod in that direction. It appears ...

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