I've rather stumbled into a debate about climate science on a Canadian coal industry blog, of all places.

I had to jump in after I saw posted a newspaper editorial suggesting that the famous Mann et al. "hockey stick" graph is now discredited, and that therefore the whole edifice of climate change science has therefore crumbled. First of all, it's not true that Mann et al. is discredited. But even if, the whole of climate science is much more rich and complex than a single paper!