An Abrupt Climate Shift?

…The Sahara’s “green” era, known as the African Humid Period, likely lasted from 11,000 to 5,000 years ago, and is thought to have ended abruptly, with the region drying back into desert within a span of one to two centuries.

Now researchers at MIT, Columbia University and elsewhere have found that this abrupt climate change occurred nearly simultaneously across North Africa…

http://zen-haven.com/research-points-to-abrupt-and-widespread-climate-shift-in-the-sahara-5000-years-ago/

This issue is addressed in Adam, The Altaic Ring & “The Children of the Sun”.  Of course an abrupt climate shift could not have been confined to North Africa.