I've read and heard lots about the very complex models used to predict temperature change over the next century or so. Obviously, we won't know how accurate their predictions are until we arrive at the future they seek to predict. One provisional test of their accuracy, though, would be to see how accurately they "post-dict" temperatures over the past 100 years. Has that been done, or do sufficient data not exist to do that? If the former, what have the results been?
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