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From: RichTravsky <traRvEskyM...@hotmail.com>
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Subject: Climate change enabled OoA
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Longish article, follow link for more.

http://www.newscientist.com/article/dn22277-climate-change-determined-humanitys-global-conquest.html

Humans may have conquered the world, but not without a big 
helping hand from climate change. A major study of the last 
120,000 years of history reminds us that, while we are 
adaptable, our species is ultimately at the mercy of the 
climate.

Homo sapiens evolved in Africa around 200,000 years ago, but 
only left the continent about 70,000 years ago. After that 
our species rapidly went global, colonising first Europe and 
Asia, and then Australasia and the Americas.

But why did early humans linger so long in Africa, and what 
spurred them to finally move? Several theories have been 
proposed, but according to a large effort to reconstruct 
the last 120,000 years of human history – including the 
climate we lived in and the vegetation we fed on – the 
current population spread around the planet would not be 
as it is without key changes in the climate.
...