Global warming was an issue well before that date too. There were holes in the ozone layer over the north and south pole in the early eighties.
Which ponders the question - what have we done about it?
The hole in the antarctic ozone layer was a separate problem to that of climate change and, thanks to international bans on the production and use of CFCs, is now pretty much a solved problem:
Hole in ozone layer has shrunk thanks to worldwide ban of CFCs, Nasa confirms
Back when I was at school, the doom and gloom was split equally between nuclear war and the impending 'population explosion'. The former has pretty much happened as predicted but the latter has not materialised... yet.