This is primarily aimed at the racist CCD David Duff and the CCD Bishop Hill but I'm happy for anyone to chip in. I might regret this but we'll just have to see.
Duff et al, I invite you to post a peer-reviewed reference supporting your position of denial. I'll make a special exception for it. That's a promise.
However- and do take note of this Duff as your cherry-picking of references makes me very wary of offering you any sort of licence to abuse others' ignorance- your reference cannot simply be methodological critiques a la McIntyre & McKitrick (2005). I am talking about original, peer-reviewed research that demonstrates that anthropological forcings are negligible in comparison to natural ones.
I'm actually interested to see what you come up with.
Anyone interested in entering the discussion should focus on this paper, as preferred by Duff.