How many AGW deniers does it take to change a light bulb?
None, because there is no proof that the lightbulb needs to be changed. It might be a power cut, or a wiring fault, and in any case those new commie low energy lightbulbs contain mercury and osmium and kryptonium and they cost a lot and what about the jobs in the tungsten filament industry and they are really expensive and the old ones warm up the room and anyway we should be free to waste our money if we want to and so on ad infinitum.
Why did the climate change denier cross the road?
Because he thought he could get across before the car got to him and anyway he didn't hear it coming and there aren't many cars on that road normally, and anyway he had private health insurance.
How do you tell if there is a climate change denier in your fridge?
Because you can hear him mumbling about how cold it is, which proves that man-made global warming is a huge fraud conspiracy on the part of Al Gore so that he can get rich.
Click here if you are looking for proof that man-made emissions are producing climate change.