Julien wondered: Until industrialization, never a crash has put the survival 
of the specie at risk, right? 

Right! Or at least as near as I can tell. Richard Leakey devotes the better 
part of a chapter to this in "The Sixth Extinction" and most anthropologists 
with whom I'm familiar generally concur.

There is a recent discovery that human genetic variation is inexplicably 
narrow. But this is thought to have ocurred from a diminished gene pool 
(dieoff?) before the third African diaspora ...the one during which modern 
Homo S. Sapiens spread out to populate the entire planet.

Hallyx

"Left to her own devices Gaia will sort herself out.  The trick is not to be 
too obviously part of the problem, otherwise she'll sort us out too." ---Ryan 
Curtis



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