> I lived through the 60's and 70's and I do not recall ever hearing this.

Really? I do: https://www.skepticalscience.com/ice-age-predictions-in-1970...

> Again, I just don't recall ever hearing this.

I think he's referring to either the "acid rain/forest die-off: http://notrickszone.com/2014/08/05/1980s-dire-warnings-of-ac...

or the rainforest (this article contains a bunch of environmental scares that didn't happen): http://notrickszone.com/2014/08/05/1980s-dire-warnings-of-ac...

Or maybe the forest fire commercials: https://www.youtube.com/watch?v=LH_MW0Bi7L4

Or maybe conflating them to make a point.