I’m the US, the EPA was created in the 1970’s. We definitely have less pollution (of certain types) today than we did in the past. Some notable examples of how disgustingly polluted American skies and waterways were in the past:
Coal Production has also been declining
And then of course less visible examples like the Montreal Protocol stopping corporations from depleting the ozone layer.
My point is in terms of greenhouse gas production we are much higher than in the 60’s and 70’s, but we have massively improved in a lot of areas. Of course there is still room to improve.
That we should go back to knowingly destroying the ozone layer because the lingering effects of our previous attempts at destroying it haven’t gotten completely better yet and that has had bad effects on air conditioning. Won’t anyone think of the poor deprived people forced to sit in their cars that are a sweltering 70 degrees Fahrenheit?