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Originally Posted by MrLabGuy
Earths major swings in global temperatures fall in line with solar activity which would lead any reasonable person to conclude the sun has a much greater influence over global temperatures than man.
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Surely, but even a small change of only a few degrees in worldwide temperature would lead to global changes which could very well leave the planet uninhabitable for life. There is a reason why most planets do not have life on them. It takes a very delicate blend of factors for life to exist, and even what may seem as "minor" changes to those factors could upset the balance very easily.
As MD pointed out, the earth has been around 4.5 billion years. What he did not mention, was that for the vast majority of that time, there was no life on earth.