I am not a scientist, but I was trained to be one. When a graduate student in the 70's, one of my professors was the late Stephen Schneider, the guru of Global Warming, but back when I knew him, he was advocating Global Cooling, citing human caused aerosols for the coming disaster.
Then, he decided that he had overestimated the effect of aerosols and had underestimated the effect of carbon dioxide and Global Cooling became Global Warming. I have always suspected that he had figured out that the real money would be found with a Global Warming Scare. Back then, climate science was an academic backwater, but Schneider turned it into a lucrative boom.
Yes, I remember the Global Cooling mantra around the time of the first Earth Day.