I have a distinct memory of two of my friends in college in the mid-80s talking about this. One was reading the paper. He announced without looking up that there is a new Ice Age coming. The other guy jumped up, looked out the window, and said, "Where!?"

It was just another crackpot theory used to fill space in the newspaper. Back then, the serious neurotics used the threat of nuclear annihilation to make themselves sick with worry.