Climate models seem to pretty useful tools for predicting future climate. Considering constant refinement of the models and Moore's law, it is conceivable that today's climate models are far more accurate than the ones developed a decade or two ago.

However, it would be interesting to how accurate 20th century climate models actually were.

To what degree of accuracy did 20th century climate models predict the temperatures of today?

If they were inaccurate, to what degree were they off the mark?

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    @Vikram Thanks for editing. According to your own research, apparently no one but your friend seems to believe this claim. Unless the claim has some significance for a number of people, it's off topic here. I'll give a look as wells to see if I can find some evidence of that. It's a good question, worth answering, if notable.
    – Sklivvz
    Jan 4, 2017 at 12:27
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    There is only one meaning to "accurately predict": whether the actual measured temperatures and numbers are within the margins of errors specified in the models or not. That's why in science measurements and predictions are never pure numbers, and should always have an associated uncertainty.
    – Sklivvz
    Jan 4, 2017 at 12:29
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    @Sklivvz Under the World Climate Research Programme (WCRP) the Working Group on Coupled Modelling (WGCM) established the Coupled Model Intercomparison Project (CMIP) as a standard for studying the output of coupled atmosphere-ocean general circulation models (AOGCMs). CMIP provides a infrastructure of climate model diagnosis, , intercomparison, and data This framework enables a community of scientists to analyze GCMs. Virtually the entire international climate modeling community has participated in this project since its inception in 1995. cmip-pcmdi.llnl.gov/cmip5/guide_to_cmip5.html
    – user36356
    Jan 4, 2017 at 16:35
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    I think this question deserves reopening. I have edited the body of the question to be as unbiased as possible. Please consider.
    – Vikram
    Feb 8, 2017 at 10:43
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    I think I would have marked this as a duplicate of this, which in turn is a duplicate of this.
    – Oddthinking
    Feb 8, 2017 at 14:42


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