Is global warming manmade or not?

Rob asked:

In Earth’s past, we’ve mile-deep ice covering every inch of the planet, and other times polar ice caps were nonexistent. Why then would global warming not be a natural process? I’ve seen “An Inconvenient Truth” and the information it’s based off of is only 600,000 years of earth’s 4.6 billion year history, which is practically nothing. Does this mean that manmade global warming is a scam and that we should just let nature do its work and melt the polar ice caps and kill the polar bears?

winter

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