They'll ignore it and make up "revised models", just like they ignored their previous predictions of an ice-free Arctic (the earliest I found was for the year 2000).
You can't argue with a Doomsday Cultist, and that's in effect what AGW has become....just another Doomsday Cult. No amount of fact, no failure of the world to melt will convince them.
Which really is too bad because I support much of what they want to do....move away from fossil based fuels as much as possible, diversify out our energy sources with solar and wind and tidal energy and nuclear, do some farming and livestock raising smarter/better, plant more trees. But they wrap it up in this redistributionist "end capitalism now" nonsense that just renders the rest of their message unhearable.
Ferret