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Politics : Sioux Nation
DJT 13.32-6.0%Nov 6 3:59 PM EST
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To: Triffin who wrote (91163)12/8/2006 1:04:21 PM
From: Wharf Rat  Read Replies (2) of 360935
 
Opposite example...gets colder and colder, too.

Twice, 710 M and 600 M years ago, we crossed a threshold that almost exterminated life, freeing the planet right to the equator. (CO2 levels were low at those points).
Has to do with albedo; sun reflection. Snow reflects up to 90% of the heat. Black absorbs it. Once a certain proportion of the earth is covered with snow and ice, enuf sunlight is reflected to cause runaway cooling. Happens when ice sheets reach about 30 degrees of latitude.
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