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?