But, there is more to the story. Models improve with time. Deniers want models to be perfect right away and, if they aren't, then the science is invalid and should be abandoned. But, what if that were applied to weather models? Then, the models we use for daily weather and things like hurricane forecasts would never improve. Take a look at the improvement made in hurricane forecast models:
Now, ask the deniers if they would rather not have improved hurricane forecast models. When they answer, ask them why the wouldn't want improved climate models?
I'm betting they won't be able to give you a logical answer.