Joined: Jan. 2006
Am I right in thinking your sticking point here is to do with the use of the word(s) "denial"/"denialist"/"denier"/"denialism"?
If so I gave you (the bare beginnings of) an answer a while back. Tautologous though it sounds, many of the people who might be designated "global warming denialists/deniers" are so designated because they engage in pretty standard denialist tactics. The fact that it's to do with global warming and not other common denialist topics like, say, The Holocaust, evolutionary biology, dose response relationships in medicinal chemistry (think: homeopathy) etc is immaterial. The subject of the denial is not relevant, the techniques/tactics/methods are.
In the things I linked above previously, you can find the beginnings of a discussion about why those terms are used, when and for what reasons.