[MrEdd]

Drought also destroyed the Mayans.

[Battle Axe]

And drought is caused by:

a) Al Gore
b) advanced technology
c) burning fossil fuels in excess
d) libtard democrats
e) sunspots

[katana]

As in a "perfect storm" scenario, several disparate factors coming together at a single moment were probably at work in all cases of societal collapse. A combination of overpopulation, war, drought, over reliance on a single food source destroyed by the drought or a blight, then disease. Throw in a now well established nasty swipe by Mother Nature in the form of the Santorini volcano and tsunami and you have the utter destruction of a civilization (which is usually taken to mean urban living that allows the flourishing of leisure and the arts).

The idea that a couple degrees rise in average temperature alone could bring down a civilization is fantasy. Now, a five degree temperature drop? That could be a real problem.

[Kozy]

Knowing what caused or didn't cause global warming then will help us combat global warming today. I know, I know, world temperatures haven't risen in 15 years.
Let's eliminate some causes du jour in this exercise. It wasn't cars, nor coal burning power plants, nor bovine farts. So what is consistent then and now, why that old glowing object in the sky, the sun. It's the sun, stupid!!!