Reply #42: Are you saying a return to conditions before anything approaching a human evolved would be OK?

[muriel_volestrangler]

Saying "it was warmer X millions years ago" is not particularly relevant to an attempt to keep over 6 million people going in something like civilisation.

The Younger Dryas may well have been caused by the pulse of fresh water from North America - see http://www.ldeo.columbia.edu/res/pi/arch/examples.shtml . If a similar thing happened now, putting at risk millions of lives, I'd suggest we do what we could to save those lives. I suspect you would too.