[Delacon]

Well I think he is trying the emphasize the fact that we have pretty much wrung out all the global warming potential from CO2 unless all these positive feedbacks that are supposed to affect water vapor come into play. As I understand it, almost as bad a vacuum, nature abhors a positive feedback. Correct me if I am wrong. I ain't no scientist.

[palmer]

Yes, the positive feedbacks are all modeled. The simplest models just say there will be more water vapor so the earth will be much warmer. No wind, no clouds, no convection, no condensation, no solar effects -> no credibility. The more complex models are almost as flawed because many of those things in that list are not being modeled at small enough scales to get them correct (e.g meso-scale weather).