Tim Lambert has a brief comical summary of the goings on at Heartland's 2009 International Conference on Climate Change. The important thing to take from this is notice how the denialist's arguments are often mutually contradictory. This is a sure sign of crankery, because scientists would begin debate with each other over these differences, rather than taking the Intelligent Design big tent approach and ignoring them as long as everyone is against evol...er, anthropocentric global warming and the political actions it implies. So some say its the sun, some say it isn't, some say it's volcanoes. Some say its a vast conspiracy, while others claim there is no consensus. For some human CO2 emissions are too low to effect any change, while others claim the emissions are too high to have done so. Some say its cooling, some say its warming.
This is not what science looks like. This is what it looks like when people with personal nonscientific motivations against a position grasp at any straw they can to deny it. I'm just glad they gathered in one place so this could be made more plain.