'I remember in the 1970s when the "scientists" shouted from the rooftops, "an ice age is coming!"'

That may be what you remember, but what you're actually referring to was a myth circulating in the popular press at the time (and, unfortunately, continuing today as an argument against global warming). There were no scientists or science publications that claimed that an ice age was coming. There were a few papers that discussed atmospheric aerosols, which do have a cooling effect, and these were the likely sources of the myth, but there were no mentions of an impending ice age. The Clean Air Act 1970 resulted in decreasing aerosol emissions.