I want to make an additional point, polemically useful toward deniers. Since they have chosen to spurn ALL qualified expert advice, their efforts to slow down energy research and efforts to achieve energy efficiency can be legally looked upon as knowing and open-eyed obstruction of efforts, by the majority, to avert a well-seen disaster. In other words, they can, according to common law and tort law, be held accountable for financial and civil damages, should that disaster come about

This point has (to my knowledge) never been openly stated. But it can really rock back your conservative neighbor. He tends to assume that, in the world to come, he will be one of the winners, regardless of what happens. Conservatives are used to suffering no consequences for being wrong -- about civil rights, womens' rights, Supply Side Economics...

...but here is a case where, if they prove wrong, those who suffer the worst effects of preventable GCC will have legal recourse to attach the assets of those who vigorously and knowingly thwarted measures to palliate the harm. Indeed, in the bitter angry world that ensues, the resources of such people will be politically and emotionally vulnerable, as well. No one will pity them.

I am not saying this in some hysterical threat-mode. It is parsed as a simple legal matter of cause and effect. And they have now been warned.