The Sahara Desert is probably your best example of changing climates, and most people believe that its the shifting magnetic poles that brings the area into vegetation and out of, again, and again. If you could control it to some degree, you could decimate billions of people - yes. Between the Mediterranean Sea, the Black Sea, and the Sahara/middle east - theres just too much shit coming up before and around the younger Dryas period that discredits main stream archaeologists.
Shit gives me real Indiana Jones type of vibes, and I bet theres a ton of stuff buried all around those areas thats just lying in wait, to be discovered.