About two years ago I had the great pleasure of dining with Roger Penrose, who is perhaps the greatest living theoretical physicist.  I asked him what he thought of the controversy regarding global warming and he said that he didn't understand why there was any controversy, the effect is clearly real.  You have to wonder why the deniers think they know more about physics than Nobel laureates. By the way, the name dropping here is intentional--I know it will just drive the troll crazy that I had dinner with Penrose--and it was much more enjoyable than the lunch I had with Fred Singer