ID a circa-1960 educational film mentioning the greenhouse effect - it's not "The Unchained Goddess"

I’m trying to recall a classroom-type 16mm film I saw multiple times as a kid. It had to do with the science of weather. Included was a section about the greenhouse effect - I remember the narrator saying “Average world temperature could rise a few degrees” and “Much of the world might become semi-tropical” - something close to that.

It was in color, and may have had a time lapse sequence where you see a clear sky clouding up and a storm forming in the space of a minute or so. Or I might be conflating something from a different film as being in the one I seek.

Once again, it’s not the Bell Telephone film called “The Unchained Goddess” - the one with Dr. Frank Baxter and cartoon characters. Any ideas?

Weird. When I was in grade school in the '70’s, the big fear was a new ice age coming on.