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Politics : Sioux Nation -- Ignore unavailable to you. Want to Upgrade?

To: Triffin who wrote (91302)	12/8/2006 6:54:04 PM
From: Wharf Rat	Read Replies (1) \| Respond to of 360936

Oh, Lord. you don't want to make it easy, do you? And the physiology is a lot more complex than it appears. en.wikipedia.org In simpler terms, biological responses tend to regulate the state of the Earth's environment in their favor. physicalgeography.net It appears that the planet has been heading towards stabilization as it matures. Up to 2.2 bil years ago, there wasn't enuf oxygen to support much life. By around 600 M years ago, O2 levels had increased to allow larger critters, the ones we find in fox holes. or fossils. or whatever. About 540 MYA, after that second cold snap, living things began to build carbonate skeletons, and began to alter CO2 levels. We've only had ice ages twice since than. It's thought that, 300MYA, the planktonic calcifiers, the ones building skeletons, were floating and dying in the open ocean, moving CO2 control away from the shorelines, and further stabilizing temperatures. Part of Lovelock's theories are based on the fact that solar radiation has increased by 30% since life evolved, yet the temperature has remained fairly constant. Since a change of 0.1 percent is enuf to trigger an ice age, he thinks the constant temp is not a result of mere chance. Even at the extreme, the Milkanovich cycles only causes a 0.1 % change. jesse.usra.edu We may have begun to interfere with the natural processes 8 K years ago... the beginning of the Antropocene Era, which Ruddiman places back 8K years. (Crutzen only puts it back to 1800 AD.) Ruddiman thinks we wrested control of the methane cycle when agriculture began in Asia, New Guinea, and in SE Australia,where eel massive weirs were constructed.