Even in the 70s most climate scientists were expecting human caused global warming. The cooling thing was more a media phenomenon.
1965 - 1979 there were a total of 7 scientific papers predicting a cooling climate. Compared to 42 predicting human caused global warming (Peterson 2008).
Pretty interesting, thanks for answering. I wasn't even born, found a nice wiki link where scientists predicted cooling because of aerosol increase but the greenhouse effect was apparently published about in 1972 so they should have known:
