I honestly think the deliberate ignorance of the American public combined with the influx of pseudoscience "muddying the waters" has driven him crazy. He really does know his shit, and knows who to talk to when he doesn't. Having to constantly "debate" science facts with a general population who need warning labels telling them coffee is hot has essentially pushed him to the "extremism" side of things. He's now painted as a fanatic and many people will automatically dismiss any point if he's trying to make it.
Climate science is not an exact science, but we do have a planet with millions of years worth of data that scientists have been analyzing for centuries. Have theories evolved? Of course they have, that's the basis of the scientific model. Hypothesize, test, observe, repeat. When multiple tests performed by different people generate the same results, a scientific theory is generated. Again, the deliberately ignorant public mis-uses the term theory, "Evolution is *only* a theory..." Yes dipshit, evolution is a theory, gravity is a theory too, so why don't you fly away.?"
P Seriously, what did he do? Wear a neck tie instead of a bow tie? 
