A review of some calculations and projections from simple climate models. Global warming was not on many people's radar at the time. The projections were audacious at the time, but conservative by today's standards. The paper's lead author is none other than Jim Hansen. (a nod to RealClimate - an excellent resource for reporting science based global warming issues)
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%, and easily beating naive predictions of no-change or a linear continuation of trends. It is also a nice example of a statement based on theory that could be falsified and up to now has withstood the test. The “global warming hypothesis” has been developed according to the principles of sound science.