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The funny thing with global warming is that, from what I hear (which could be wrong), natural sources (e.g. volcanos) actually put more greenhouse gases in the atmosphere than anything humans have made (in fact I think there was a percentage of greenhouse gases contributed by humans, and it was rather small).
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The Yellowstone mega volcano might explode any moment or in a million years and with that comes a new ice age. We might be looking at the last seconds of the world as we know it right now.