-- Leonard Nimoy, 1978
Well, maybe some of thought a next ice age might be on its way (though there was no consensus). Some of them thought otherwise, as this list of global warming papers since 1827 shows.
"In Search Of" was a popular TV show at the time, but not exactly known for its scientific accuracy or skepticism. After all, they did shows on, among other things, Bigfoot, The Bermuda Triangle, Atlantis, and Dracula.
P.S. - In high school I went on a field trip to Pittsburgh to see Leonard Nimoy in Twelfth Night. It was theatre in the round, and at one point as he ventured into and around the audience speaking his part (Malvolio), he sat down in the seat just next to me. Which was kind of thrilling, him being Spock and all.
And here (!) is an article in the Pittsburgh Post-Gazette about Nimoy's performance there.