I've a feeling I'm going to regret commenting on this one, but I'll risk it, with no offence intended to earlier comments...
The overwhelming majority of climatologists are united in the belief that the earth is warming up at an unprecedented rate, and human activities are a major cause of the warm-up.
It is my understanding that climatology is a relatively new qualification at most institutions and so it's reasonable to assume that many climatologists chose their careers after already developing an interest in global warming. That being the case, it's hardly surprising that they are united in the belief that global warming is
'true'. UFO-ologists are largely united in a belief that aliens are all around us, but it doesn't mean they're right.
I personally think it is right to question the warming theories, and to be open minded to the possibilities that the whole thing is a huge and very expensive mistake, and a bandwagon on which the politicians have jumped because it conveniently allows them to bring in a whole proliferation of taxes to 'save the planet'.
Maybe global warming theories are true, and maybe they're not. I try to remain open-minded and I just haven't seen nearly enough (unbiassed) scientific evidence to convince me one way or the other. Whereas I have seen plenty of evidence of governments and private entrepreneurs alike, cynically seizing the opportunity to make a fast-buck out the whole thing. That exploitation, it seems to me, is the only thing we can be certain of at this point of scientific understanding.
Now crossing my fingers that I don't regret 'stirring' things