I think its no good idea, esp. if you call it "climate change". Choose a serious topics that doesnt focus on the results of current climate models and underlying assumptions and data. As mbq pointed out, there are meteorology (for used data and models) or theoreticalphysics (for underlying mathematics - deterministic chaos). But dont ask about results or rationality of assumptions. This is biased politics and can neither be objectively analysed nor answered.
I made a proposal myself about futurology
But this is only aimed on methods, mathematics, factors of societal/environmental/techn. evolution, NOT about future prediction, speculation or asking how reliable this or that climate model/result is, these conclusions you have to draw on your own. You can ask, what were the assumptions of calculation and model X, but its not for discussion and imho the Q&A format doesnt fit debating of global warming at all. There are much better discussion forums and climate blogs available.
You also see no serious one here making a "Big Bang theory" proposal. This is simply unscientific, as there are no true theories, there are only theories not falsified yet ;) No serious scientist would visit such a site/proposal.