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The Earth's atmosphere changes only slowly, from causes that we do not completely understand. We know, from studies of ancient trees, that atmospheric carbon dioxide levels have been both much higher and somewhat lower than they are now. We also know that there have been periodic warm periods (for example, the Medieval Warm Period from about 900 to 1300) separated by times of extreme glaciation and cold.

There is not much consensus on what stage of the cycle we're in right now, or to what extent human factors have played a role. Certainly the major causes of SUDDEN change in the atmosphere are almost entirely volcanic in origin; that isn't really related to HUMAN history, since volcanoes have been erupting since the dawn of time.

If your premise is to examine anthropogenic global warming, there's actually very little "science" at its core. It's well to remember that Al Gore, the high priest of global warming, had a RELIGIOUS education and is very poorly trained in actual SCIENCES.

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