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The question was not whether you strongly believe that human activities are the sole cause of GW. It was whether you believe human activities contribute to GW. I think all the candidates agree with that to some extent or another. The difference between liberals and conservatives is that the liberals fail to take into consideration all of the other main causes. And they really diverge from us on the solutions.

Fred answered the same question on global warming before:

Q: Is global warming a man-made problem?

A: From what we know now, it seems to be in part, certainly. I think that we don't know how much yet. There are a lot of other things we don't know. There's got to be a global solution to it, there's got to be an international solution before we can do anything. We could take a lot of drastic measures here and it wouldn't even make any difference if China, and India and a lot of other countries don't participate.
http://www.freerepublic.com/focus/f-news/1899146/posts

I think Mitt and Fred have similar positions on this. You are just employing that good old double standard for Mitt we've all come to know and love.