So what's the alternative?

Pretend there is no reason to believe burning fossil fuels discharges CO2?

Pretend Discharging CO2 can't cause a rise in atmospheric CO2?

Pretend increased CO2 levels aren't real?

Pretend that there is no evidence for Global warming?

Wait is that in the Republican platform based on the technical expertise of Rush Limbough and Glenn Beck?

Lots of objections to Climate models are valid, but the fact is there is no alternative. Analytical solutions to such complex systems are not available. Climate models are just as subject to scientific review as any other theory or model so any objection should be based on the specifics of the model not models in general. This does not happen in general because most of the deniers are not competent to evaluate the models on a technical basis.

Regards,
Mark (Someone who has actually built a computer model)