The greatest human tragedy in all this is that contrarians and denialists have been so successful in burying this sort of solid information from which people can constructively learn.
Instead, the Republican machine (with their "libertarian" pals) remains committed to it's 1950s mindset, faux think-tanks and single minded focus on power-politics. Rather than any commitment to honestly learn about the scientific issues or facing up to the obvious consequences - they'd rather ruthlessly attack anyone and anything that threatens their perceived personal interests, than learn. No matter how compelling the information.
Here's another unauthorized pilfering, and sharing, this time a complete and nearly eight year old RealClimate.org post - that's as relevant today as it was back then:
Dummies guide to the latest “Hockey Stick” controversy
Part I: Technical issues: