I have a theory about that. I would today consider physics to be the science with the highest prestige among sciences. I think it is that way because of physics big funding, stemming from a close relationsship with big government and big industry. Physics gives guns and toys. The problem with climate change (from a physicist perspective) is the lack of solutions involving big piles of money to physics reserach. Hence the denial.

The alternative solution is to claim that it is an astronomical effect, where the sun is causing increased heat (nevermind that pouring out ghg should have some effect), because that would get astrophysics institutions more money.

Now, I am not saying that individual physicists are trying to shut down a theory that would hurt them. It is probably not that easy. It is more that a theory that hurt physics (as an institution) gets disliked among physicists and therefore a greater number of physicists then people in general becomes climate change deniers. Add the credibility of physics in general and you get prominent climate change deniers.

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