Snopes says the Time Magazine "Global cooling/Coming Ice Age" issue was a hoax. Never was printed.
"Refuted" at length. With lots of snark.
But... Butt... Time also printed this in 1974 (direct C&P):
The article said, 'Telltale signs are everywhere — from the unexpected persistence and thickness of pack ice in the waters around Iceland to the southward migration of a warmth-loving creature like the armadillo from the Midwest. Since the 1940s the mean global temperature has dropped about 2.7° F. Although that figure is at best an estimate, it is supported by other convincing data. When climatologist George J. Kukla of Columbia University's Lamont-Doherty Geological Observatory and his wife Helena analyzed satellite weather data for the Northern Hemisphere, they found that the area of the ice and snow cover had suddenly increased by 12% in 1971 and the increase has persisted ever since. Areas of Baffin Island in the Canadian Arctic, for example, were once totally free of any snow in summer; now they are covered year round.'
Well, Snopes just never got that copy of Time magazine... I guess.