A reader in a previous thread asks if I'm a climate change skeptic. Nope. Not being a meteorologist, physicist, geologist, chemist, etc, myself, I go with the scientific consensus on the matter, much as I assume that the biologists are right about evolution and the physicists aren't pulling my leg about this gravity stuff. I do not have the time, expertise, or inclination to investigate every single scientific claim about the world, and so I trust in the scientific method, the peer review process, and the wisdom of crowds to deliver me a reasonably reliable answer.
I'm still working out how much I think we should be prepared to do about this, but I believe it's happening.