The world was definitely getting colder, growing seasons were getting shorter, the cost of heating was getting more expensive- in short we were doomed.
Sounds like a crazed Al Gore in reverse.
Seems to me it was all designed to get us to stop using oil, which was projected to run out by the 1990's, lest we freeze to death as this hapless gent on the cover of Time in 1973- "The Big Freeze"
Here are some links to articles in Newsweek and Time from the 1970's including some interesting cover stories and images, warning us of the dangers of GLOBAL COOLING.
Time Article June 1974 "Another Ice Age?" Blurb.