First time I ever heard of “global warming” was in 1988, which was an unusually warm summer, at least in SE Pennsylvania.
The idea seemed to really take off after the “heatwave” in France in 2003, which was said to have caused the deaths of 14,000 elderly in nursing homes.
I remember when hole in the ozone was going to be so big that the earth would be so hot we would all be did by 1990.