The global ban on CFCs (https://en.wikipedia.org/wiki/Montreal_Protocol) is working, and although there are still big holes that open and close every year we're on the way to getting back to pre-1980 levels of holes by 2060. https://public.wmo.int/en/media/news/record-breaking-2020-oz...
...A recently reported slowdown in the decline of the atmospheric concentration of CFC-11 after 2012, however, suggests that global emissions have increased...
We show that emissions from eastern mainland China are 7.0 ± 3.0 (±1 standard deviation) gigagrams per year higher in 2014–2017 than in 2008–2012, and that the increase in emissions arises primarily around the northeastern provinces of Shandong and Hebei. This increase accounts for a substantial fraction (at least 40 to 60 per cent) of the global rise in CFC-11 emissions.
https://www.nature.com/articles/s41586-019-1193-4
Still, the Montreal Protocol is a good example of what can be achieved when we finally reach an imminent crisis.
1. We have more ozone holes now.
2. We weren't constantly in direct contact with sunlight. If you move past very early stages, we had shelter in forests, caves, tents, igloos.
3. When we were in direct contact with sunlight, we had a darker skin, which is more resilient to that.
Correct me if I'm wrong.