The global temperature cooled off from the 1930s through the 1970s. Archaic climate models in the 1970s overstimated the effects of sulfate aerosols and also didn't figure in as much reduction in sulfate aerosol emissions as occurred (largely to alleviate acid rain problems). So since 1975 we've warmed up quite a bit. Except for the unlikely specter of a shutdown of North Atlantic deep water formation (which would result in a strong hemispheric cooling most drastic in Europe and eastern North America), there aren't any climatologists predicting a significant cooling trend or Ice Age now.
It's interesting to read the history, though. I remember that too.