I don't know about "super-sophisticated" but this is definitely super liberal elitism on display. It's as if Steyers doesn't even realize what he's saying here. That billionaire liberal elites such as himself have convinced other left elitists that man-caused global warming is real. That's true of almost every political position held by the left. The difference is they tend to con minorities and union members on many other issues. Global warming isn't sticking in this country and they can't figure out why.
I think the honest answer is the conservative media. One of the things conservative talk radio and other conservative platforms are very good at is presenting a contrarian point of view to liberal conventional "wisdom." And even the liberal rank and file may have noticed Al Gore refuses to be confronted on his belief system.