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.
It’s a confusing world you live in.