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:

The skies of Pittsburgh, PA

the Cuyahoga River fire

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.