I have found it necessary to begun deleting comments of a particular commenter who appears to be a climate change sceptic/denier. On reflection, it seems worth saying a little more about that.
I certainly don't want to impose a litmus test on commenters broadly. If I get the feeling that people are looking at my posts, or other comments, genuinely curious about the issues, thinking for themselves, and making whatever points about the issues occur to them in good faith, or asking questions, I have no problem with that. There have been occasions when I thought a particular climate paper was overblown, and I've said so.
However, there is clearly a large climate denialist movement that is a) heavily funded by moneyed interests, and b) also supported by a bunch of people who don't have have a direct current pecuniary interest but are unable to admit even to themselves that (for example) their career in fossil fuel extraction was contributing to major harm to the climate, or are very ideologically rigid and cannot admit that maybe sometimes free markets and large businesses commit significant harm as well as causing much good.
I think the climate denialist movement is almost 100% in bad faith, and if I get the feeling that someone is basically parroting the standard talking points from it, bringing up all the bogus non-issues that it manufactures (eg Climategate) I just have zero interest in providing a forum for that. It's my blog, I read all the comments, and I don't want to read ones like that (or the inevitable equally partisan backlash from the other side). Find a different forum (there are plenty of both persuasions who will be happy to indulge you in endlessly rehashing that stuff). There's clearly tremendous potential for comment threads here to devolve into yet one more long trollfest on those issues, and I will not allow that to happen.
My interest is to understand and evaluate the actual climate science - what is it saying, how much reliance on it can we safely place, what does it tell us about our future? Anyone who, in my judgement, shares a genuine desire to do the same, and a commitment that finding out the truth is more important than promoting a particular ideology, is more than welcome to comment here.