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IMO most if not all empires fell and migrations out of Africa were due to climate changes that exacerbated conditions such as lack of plant food and game; increased pestilence and disease.
Disaster That Struck The Ancients
BBC | 7-26-2001 | Fekri Hassan
Posted on 12/08/2001 2:51:43 PM PST by blam
http://www.freerepublic.com/focus/f-news/586511/posts
The Cold Snap That Civilised The World
The Telegraph (UK) | 2-22-2002 | David Derbyshire
Posted on 02/23/2002 2:33:42 PM PST by blam
http://www.freerepublic.com/focus/news/633991/posts
Archaeologists Unearth 1,700 Year-Old Canal System Near Lake Okeechobee (Florida)
Sun- Sentinel | 6-6-2002 | Rhonda Miller
Posted on 06/07/2002 2:13:56 PM PDT by blam
Edited on 09/03/2002 4:50:36 AM PDT by Jim Robinson. [history]
http://www.freerepublic.com/focus/news/696466/posts
The Dark Ages: Were They Darker Than We Imagined?
The Universe | 9-1999 | Greg Bryant
Posted on 06/08/2003 10:31:29 PM PDT by blam
http://www.freerepublic.com/focus/f-news/925578/posts
Drought That Destroyed A Civilisation
The Herald (UK) | 11-11-2003 | Martin Willians
Posted on 11/16/2003 11:05:23 AM PST by blam
http://www.freerepublic.com/focus/f-news/1022897/posts
Smithsonian Scientists Connect Climate Change, Origins Of Agriculture In Mexico
Eureka Alert | 6-1-2007 | Dolores Piperno
Posted on 06/02/2007 1:52:29 PM PDT by blam
http://www.freerepublic.com/focus/f-news/1843791/posts
New Work Shows Shawnee Lookout Site to Be Ancient Water Works, Not a Fort (Not full title)
University of Cincinnati | Sep 12, 2008 | Carey Hoffman
Posted on 09/12/2008 10:01:30 AM PDT by decimon
http://www.freerepublic.com/focus/chat/2080920/posts
Monsoon link to fall of dynasties[China]
BBC | 06 Nov 2008 | BBC
Posted on 11/07/2008 8:53:13 AM PST by BGHater
http://www.freerepublic.com/focus/f-chat/2127932/posts
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Correlation does not equal causation.
From what little I know, which aint much at all, on the subject of ancient timey type farming...
Do What Great Great Great Great Grandaddy Did was the height of technical advance at the time.
Primitive farming techniques would be grossly affected by even small changes in weather patterns.
Seems to me that it’s rather amazing that civilization collapse events weren’t even more common than they were.
Scientists Show That Vegetation Conditions Drive The North Africa DroughtWilliam Lau, a Goddard Space Flight Center (Greenbelt, Md.) atmospheric scientist... along with UCLA atmospheric scientists Ning Zeng and David Neelin, found that the addition of vegetation to climate computer models proved to be the missing link in what was driving the drought... changing sea surface temperatures couldn't account for much of the drought at all... another factor -- soil moisture -- ...was only enough to account for a drought half as severe as what actually happened in the Sahel. Finally, the team added natural vegetation to the model and found that the natural vegetation interacts significantly with climate, and in the case of the Sahel drought, caused enhanced drying... Also, since plants transpire by losing water through their leaves, less vegetation decreases humidity. The loss of a direct moisture supply means less rainfall, which causes weaker circulation, dampening the monsoon season... Lau said that the new model including natural vegetation changes is a much better reflection of what the Sahel region actually experienced. And it suggests that without the addition of man-made landscape changes, the climate system is fully capable of generating this devastating type of drought.
ScienceDaily
November 24, 1999
Adapted from materials from NASA Goddard Space Flight Center
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Hey, the Romans needed water for their most civilizing achievements such as acqueducts, baths, fountains, indoor flushed plumbing and heated interiors via hot water pipes in their floors.
No sense in staying in god-forsaken deserts filled with barbarians and religious fanatics if you can’t take a dump, drink enough pure water, and get a relaxing bath.