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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 ...


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I doubt you will find clear evidence for it. Dendrochronology, the science of dating by tree-ring analysis, can show fluctuations in temperature cycles, and has even been found to show growth stunting due to large-scale volcanic eruptions which caused a darkening of the skies for a protracted period of time (months rather than days). Whether trees were cut ...


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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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