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Thirty-year-old global temperature predictions close to spot-on -- even a bit optimistic http://apocadocs.com/s.pl?1333634004
Sometimes it helps to take a step back from the everyday pressures of research (falling ill helps). It was in this way we stumbled across [James] Hansen et al (1981) (pdf)....
They got 10 pages in Science, which is a lot, but in it they cover radiation balance, 1D and 3D modelling, climate sensitivity, the main feedbacks (water vapour, lapse rate, clouds, ice- and vegetation albedo); solar and volcanic forcing; the uncertainties of aerosol forcings; and ocean heat uptake. Obviously climate science was a mature field even then: the concepts and conclusions have not changed all that much. Hansen et al clearly indicate what was well known (all of which still stands today) and what was uncertain....
To conclude, a projection from 1981 for rising temperatures in a major science journal, at a time that the temperature rise was not yet obvious in the observations, has been found to agree well with the observations since then, underestimating the observed trend by about 30 percent, and easily beating naive predictions of no-change or a linear continuation of trends.
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'Doc Jim says:
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It's hard to believe that the warmist conspiracy was underway that long ago!
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