Climate change sceptics often protest that in the 1970s, scientists claimed we were heading for another ice age. Those who believe in the threat of global warming generally counter that there were only a very small number of such claims, which the sceptics deliberately keep bringing up in order to muddy the waters. The famous piece that is meant to have inspired the sceptical line of argument was a cover story in Time magazine in 1974. I just Googled it, and was surprised to find that it's on the Time website here. They must have digitized their archives. Interesting to actually read the original.
Here's someone's blog post showing that there were far more papers predicting warming, even in the 60s and 70s.