1. From the Ron Paul site, it claims that it lists the area of their specialties. If you look at the actual list, it doesn't.
2. By signing the petition, a signer isn't necessarily saying that they disagree with global warming. In fact, one of the most prominent signers (and he was mentioned specifically by Fox news on several occasions) has gone on record stating that global warming is reality - he just thinks that the proposed solutions are going to far.
3. Start checking some of the names on that list. You can get an alphabetical list of those names. I only checked the backgrounds of a few. Having chosen 5 at random, and finding 5 crackpots who happen to have science degrees, I think that's statistically significant enough for me to cast a lot of doubt on that list. Go ahead, heck, start with the first person on the list. Crackpot.
4. While many on that list are capable of understanding the research, signing the petition doesn't necessarily mean that they've ever read a bit of the research. i.e. That petition is as meaningless as a facebook petition.
Really? Out of that many people you think that's "statistically significant?"