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To: GROUND ZERO™ who wrote (2103)	7/22/2001 9:23:18 AM
From: Moominoid	Read Replies (2) \| Respond to of 12411

A simple known example is how the carbon dioxide in the atmosphere has fallen as the sun has got hotter. Carbon dioxide levels were very much higher in the Cretaceous than now. At that time huge amounts got locked up in oil deposits and more importantly limestone. Over history more and more carbon has locked up in the surface rocks of the planet. Temperatures were higher in the Cretaceous than now however and sea levels much higher due to both no ice caps and new continental breakup reduced the average depth of the oceans. But really so much is not understood in how for example carbon dioxide cycles though the ice ages. The data is there and there are hypotheses but no firm theories. When I mentioned the fragile Earth you hear so much about coral reefs being fragile, but look at the Great Barrier Reef in Australia - that huge shelf area was all land at the peak of the ice ages. Hurricanes cause substantial damage to reefs but they bounce back to new in about ten years.... I'll take a look at that link. I just made my first phone call to China ever :) David