One of the most frequent claims deniers make to refute the science is that the models don't work. This is not only false, but irrelevant. The reality is, climate models are working quite well (Sorry, all of you anti-science people, but it's true.) But, climate change isn't about models, it's about the science - the data. If you doubt that, take a look at this nice series of graphics:
What's Really Warming the World?