The "Global Warming" schtick is going to turn out, in retrospect, to have been the scientific Tulipmania of the late 20th - early 21st centuries.
All that's happened is that a certain selection of climate scientists, with a certain set of theories, have been thrust into the spotlight because their predictions are friendly to government action, and contribute to a media sense of emergency which sells newspapers. If a big enough fuss is made, and a big enough sense of politically-correct emergency can be created, governments can thrust themselves forward as our saviours, and waste even more of our money on slowing our economy down even more.
There's going to be a lot of embarrassment in 20 years' time. Or maybe not; the defeat of Communism didn't leave many of its supporters embarrassed at the end of the 80s, they just blithely carried on as if nothing had happened, and have now transferred their affections to Islamism. Nothing is going to come of "global warming", but its supporters will simply find another bunch of obscure scientists with a prediction of doom, and thrust them, blinking, into the limelight.