Perhaps if we'd never worried so much about the ozone hole, it'd be a lot bigger now. (it's still there by the way, just smaller)
Unless there was something else to stop the emission of CFCs, it would be huge by now, no question!
If anyone wants to know about the current state of the ozone hole, here's the newest report:
https://ozone.unep.org/sites/default/files/2019-05/SAP-2018-...
I like the plots on ES.24 that show the effect the regulations have on global warming (the older replacement coolants were powerful greenhouse gases). See that curve? It's going down. If the regulations are followed (and we have good precedent that they will be) we've been spared several centi-degree in warming by 2100.
This is the only really positive news I've heard so far in the context.
Some of these were/are real concerns. Certainly the threat of nuclear war was a real concern, as were CFCs leading to the ozone hole, and the threat of mass starvation. These changes were based on the realistic fear that millions or more might die.
(Continued illegal use of CFCs is not helping, btw.)
Some were/are not. Biblical predictions of the end of the world come up every few decades, and have for over 1000 years.
But aren't they all examples of being told by mass media that we're going "to die at any moment"? I can empathize that hearing about these for many decades can cause people to become inured.
Climate Change being real or not is not the point here. The point is that we have yet another generation of people believing that we're all screwed before we get old. Maybe that's it: it's actually easier for young people to believe that they don't have to make long-term decisions because they won't live that long.
Red Scare (first and second), Communist takeover, "better dead than red".
Ehrlich's The Population Bomb predicting world-wide famine by the 1980s, followed by the Zero Population Growth movement.
The destruction of the ozone hole.
For the more Biblical prophecy oriented, "The Late, Great Planet Earth", predicting the end of the earth by the 1980s or 1990s, sold 28M copies.
I could probably come up with more with a bit of research.