I think the problem is not recognizing the assholes as a separate problem from the ignorance. Ignorant people hear “giant impending calamity that will harm you and your neighbors” and think, “oh, we should do something about that!” They’re currently not doing so because a cabal of assholes has spent half a century muddying the public waters.

And, regarding “living at lower scales and polluting less” - consider how many things in your life are sold to you as disposable items and how many don’t need to be, and how many things can be produced in a substantially more sustainable fashion without negatively impacting their utility or quality. The average person can live an extremely rich, fulfilling, and comfortable life on a low carbon budget.