Why the concerns about global ice age?

This is what I saw in 1978. Very convincing as a kid... "scientists" doing analysis, and creepy music and Leonard Nimoy! We had been burning fossil fuels for nearly a hundred years at that point, built nuclear bombs, landed man on the moon, and had computers... how could scientists be so wrong?
Would you be standing neck deep in snow if it wasn't for our use of fossil fuels? Were scientists just outright wrong only 40 years ago?One thing is for sure... fear sells! Scientists can be way way off... obviously.

If there is one thing to be affraid of, it would be global warming... followed by a fast crash into global cooling. Food is abundant when there is heat... but no so much when it is cold.
Why the concerns about global ice age?
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