What I don't get is, and perhaps someone can answer me, how can humans say that they know what's going on with the ecosystem when they've been recording it for less that 0.001% of the earth's history? I mean, we've been recording these things for what, 100 or 200 years? In the millions of years that they say the earth has been around, we know nothing. It just doesn't add up, to me.
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We know of the process of glaciation ( http://www.uvm.edu/whale/GlaciersHowFrequent.html ) aka the Ice Age. From this it can be seen that it can definitely happen via nature itself, but it seems to take a very long time (300-200 million years). The issue we're seeing is that we seem to be accelerating the glaciation process via CO2 emissions.