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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: neolib who wrote (16616)	10/2/2007 9:03:42 PM
From: Brumar89	Read Replies (1) \| Respond to of 36918

Increases in CO2 have fallen major warmings in the past. You are confused.

To: neolib who wrote (16616)	10/4/2007 11:38:24 PM
From: TigerPaw	Read Replies (1) \| Respond to of 36918

ncreases in CO2 have driven every major warming in the past. Why are you confused? That is, I think, and oversimplification. The greatest cooling period in the earth's history was caused by a lack of ocean circulation. The oceans completely froze over, from equator to pole, about 600 million years ago. The primary cause was that all of the exposed land surface had migrated to a pole, and that meant that almost all currents just flowed laterally around the earth. The ice on this land became so thick it eventually broke this single landmass into the plates which now form the continents. Once of the reasons we have had ice ages now, and didn't have them 100 million years ago is that Antarctica is blocking some of the circulation that would go north-south. Of course when the landmass broke it caused volcanoes and led to greenhouse gas which speeded up the warming.