Personally I believe climate change exists, I just don't think we have any involvement with it.
Coming from someone pursuing a career in environmental science, climate change DOES exist, but politicians overstate the everyday American's role. Industry and developing economies are largely to blame. Individual contributions to the carbon footprint are a drop in the puddle compared to Chinese manufacturing and Coal fired power plants in India.
Denying climate change is absurd, but believing that recycling plastic or driving a hybrid is enough to stop it is also just as absurd.