Read this yesterday:
[President Bush] said more is known about global warming than when he first took office in 2001. Asked if it was real, Bush said, "Yes, it is real, sure is." Link.
Bush is the champion of many on the evangelical right, who also feel global warming is nonsense. So when President Bush—in theory, the most well informed man on the planet, but whose track record for obstinancy is Guinness-worthy—reverses his position on something as major as global warming, you would have to imagine it took a gargantuan stack of evidence to change his mind.
Again, I ask you: now that an oil man like President Bush has admitted his former position on global warming was wrong, how can anyone comfortably refute that?