I am aware of the Ice Age scare as well. People still point that out as a possibility fairly often. Yet now that they've labeled it "Climate Change" they would say they were not wrong if an ice age did happen.
I am 50 years old. That'll give you the time frame for what I lived for. My parents were Hippies so I've pretty much been engaged in "Earth Day" type stuff since it's inception. In fact, I think initially that was a positive movement as is usually the case. It is nothing of the sort these days.