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Politics : View from the Center and Left -- Ignore unavailable to you. Want to Upgrade?

To: Nadine Carroll who wrote (10793)	2/3/2006 4:00:43 PM
From: TigerPaw	Respond to of 541735

The major cause of climate change in the last few hundred million years was the breakup of the super-continents into the more widely distributed contenents found on the earth today. During the ages of the dinosaur the land was all together in the supercontinent Pangaea. As it broke up( about 200 million years ago) there was great volcanic activity and greenhouse gasses and warming. Once the major north-south split occurred between europe-america (60 million years ago) the ocean circulation got started between the poles and the equator. As it started and stopped sucessive waves of ice age appeared and retreated.