One showing of the Newt/Pelosi "glow-bull warming" commercial and he'd be toast.
I disagree with that.
Newt has always been a pragmatist, and he figured out, unlike other Republicans, that if you don’t offer alternatives to the Democrats’ environmental policies, then they will get their policies passed in full. The political process works under the Hegelian Dialectic: thesis, antithesis, synthesis. If no antithesis is offered, then the thesis is not subject to synthesis.
Newt sat on that couch with Nancy Pelosi not to endorse her proposals, but to offer his own counter-proposals. Newt has offered cost-neutral free-market alternatives to Cap’n Tax.
And 50% of Republicans believe in Global Warming™ to some degree. John McCain, who is a full fledged, true believer in Global Warming™ and a proponent of Cap’n Tax managed to get the GOP nomination. So there is no reason to think that Newt’s common sense alternatives to the Democrats’ plans would penalize him in the GOP primaries, much less end his run.