Evidence for Climate Change

Since 'Climategate' there's been a lot of bandwagon jumping and general eagerness to stamp on the grave of anthropogenic global warming theories. Is human-influenced climate change a great big myth after all?

Of course, the answer in general is 'we don't know'. At least, I don't. So I figured I'd do an onrunning series looking at the evidence for and against. I'll linked to relevant posts from this page.