In the 70's too. I was not a teenager yet, but I do remember rumblings about the coming Ice Age on the news and National Geographic magazines (Their used to be a Nat Geographic for kids, but I don't remember the name of it.)
With all the hot air Kerry is spewing we are Doomed...Doomed
Definately a topic in the 70's. I remember it as my first taste of liberal doom cryers. Any wonder why I was a conservative from the get go.