Thu, 8 Nov 2012, 4:20am PST
Big government perhaps?
Calendar regulations were so stringent that moving beyond 12/21/12 was impossible. Seeing they would have no future bryond that date, the Mayan society sef-destructed.
Thu, 8 Nov 2012, 4:37am PST
All those rotting human sacrifices caused a methane pulse that induced climate change. Gore said so. I need a ten million dollar grant to prove it.
What's ten mil when the fate of the world hangs in the balance?
Fri, 9 Nov 2012, 12:36am PST
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Primitive cultures seem likely to reach a city-state cultural peak, then because they have built a big city and used all the nearby firewood and employed no crop rotations, they deplete the nearby farmland. A drought would add a lot to that, but I wouldn't see it as the sole cause.
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