[cogitator]

If we can't predict with 100% accuracy what the weather will be like this Sunday, how in the Hell can we claim to predict what the earth's climate will be like in 50 to 75 years?

It's a different kind of prediction. This recent article at RealClimate addressed the exact question you asked.

Short and simple arguments for why climate can be predicted

Some of the comments are from one of my favorite FReeper climate change skeptics -- because he has a good grasp of the issue. Note that there are a LOT of comments.

[RexBeach]

Thanks for the link. I'll read it sometime today.

[Always Right]

It's a different kind of prediction.

But we know more about predicting the weather than we do about predicting climate change. There are more variables, more unknowns, more assumptions in the climate models. Yet that is the major foundation of climate change 'science'. What Alfred P. Sloan state was all true.