NASA researchers modeled what would have happened to the ozone layer without the Montreal protocol. If we had stayed on the same path we were on in the 70's disaster would have followed.
By the end of the model run in 2065, global ozone drops to less than 110 DU, a 67 percent drop from the 1970s. Year-round Arctic polar values hover between 50 and 100 (down from 500 in 1960). The intensity of UV radiation at Earth’s surface doubles; at certain shorter wavelengths, intensity rises by as much as 10,000 times. Skin cancer rates would soar.
Researchers also found that by 2040, someone outdoors in a mid-lattitude city would get sunburned in only 10 minutes.
Lack of ozone is the major reason that nothing grows on Mars. If humans ever go there, we will likely spend most of our time underground to avoid the radiation.
Life is fragile. If we screw up the planet's atmosphere we will die. We can't change the laws of physics. The climate crisis is real. It's very, very real.
The jobs and infrastructure bill is the most important legislation of our lifetime.
Reference to NASA research:
https://www.nasa.gov/topics/earth/features/world_avoided.html