Thanks Dave, I will concede that there could be someone who fits your definition of "denialist" but I'm not sure how we spot them and I sincerely doubt that the use of the word has any useful function in the debate of GW. It is ad hominem. It seems to me that it's only usefulness is to intimidate and silence criticism I.e. "oh, you are one of those..."
It may not have a useful function face-to-face, and I agree that it sounds punitive.
But I think we can use the term in a meta-discussion, to describe a catergory of participant. Just like we have to distinguish between Creation Science and Intelligent Design advocates, and as Nova Land showed, we distinguish between debunkers versus skeptics (in the CSICOP world, it's debunkers versus investigators), we benefit from distinguishing between critics and deniers.
It's a continuum, in this case, and my rule of thumb is that when you bring contrary information to a denier, they will reject it as false by definition. There is nothing you can show them that will change their mind. They may pay lip service "...of course, I could be wrong, but I haven't been shown anything that's convincing so far." But they're pretty cavalier with that 'convincing' rule.
That's why Creationists are a good analogue. I've seen creationists caught dead-to-right in a lie, and they admit it. Then, next week at a different church, they haven't removed it from their presentation. They just aren't too worried about every single details' inaccuarcy, because they think overall they're right. I think it's a cognitive dissonance of sorts.
The other thing is that there's sometimes evidence of unreasonable expectations. This is why the AGW side has had a shifting argument. Strategic manoevres to the rear, as it were, in stages:
1. there is no evidence that the world is heating up
2. there is no evidence that the world's heating is significantly anthropogenic
3. there is no evidence that the anthropogenic heating will be so serious as to merit action
4. there is no evidence that action will help reduce GW
5. the action that will help reduce GW will cost more than GW itself
6. OK, OK, we could have saved a fortune by acting, but it's too late now, so there's no point. Oh, well, it's our grandkids' problem now.
Another sign is the dependence on conspiracy theories: that scientists have some... motive... to reduce carbon emissions. Motives cited are usually quite incredible. Scientists have an agenda. The overlap with bible-thumping is not coincidental.
ETA: link to NESS podcast. Skip to about 45 minutes into the podcast, where the hosts discuss the chronic problem of denialism within skepticism.
NESS Podcast #38 (NESS is the home of Rebecca Wilson, of Skepchics fame) Here's the article he discusses in the podcast:
Skepticism and Denial by Steven Novella, MD