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My comments

ice age
We actually are on the verge of a new ice age -- ice ages are cyclical and have occured 10 times in the last million years, with warm spells (glaciers retreat and people are happy, but can no longer walk across the bering strait land bridge to populate N. America) lasting for about 10,000 years. Our sunny 10,000 years is now up, and the Earth will sometime in the future come to resemble the ice-world of Hoth.

Global warming may be a precursor to this event, changing the Gulf Stream, Jet Stream, and other major Earth systems in a prelude to the big freeze - we may be accelerating this tipping point with all the goo we're putting into the atmosphere, and global warming may actually be a last gasp before the colder times looming on the horizon.
December 17, 2006

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