I heard on the news that the current severe snowstorms along the east coast of the US proves global warming. A few years ago warm winters in the US was also said to have proved global warming. It looks like anything that happens proves global warming. Given that, there is nothing that can disprove global warming because whatever happens proves it. I blame George Bush and his evil genius Karl Rove. (In reality, unusual weather events don't prove anything because the global weather is a dynamic, unstable, chaotic system.)

Here are some comments about the current state of climate science as practiced by the the UN IPCC.