in my point of view it is simple. climate changes and that is it. it always has and always will. it just that people starting to notice it more so they get scared since - well it is a change and who knows what will happen with their beautiful lawns. personally i don't care since nature is nature and it will do as it please. and to think after all that has happened to this planet - pole shifts, asteroids, ice ages, plate tectonics and world wide fires - we, humans, are going to put this blue-green ball in danger? we can launch all of our nukes and it won't even scratch the surface of the planet and after some 30 000 years when radiation is gone everything will be back to normal and life will go on.
only question is will we stay.
i also red an interesting article. it said that cars and the rest of man-made greenhouse gasses are nothing next to a simple volcano eruption a week long which throws in the atmosphere more sulphur and aids warming the same way humans do in 20 years.