> The ozone hole problem has been essentially solved, acid rain has been essentially solved, mass scale water pollution like rivers catching on fire
All far less expensive to fix. Never actually heard of rivers catching fire?
Has acid rain been solved globally?
The ozone hole problem we got lucky on. It required global action but a lot of things lined up. Things like the British prime minster at the time being a former research chemist and therefore understanding the issue, and being successful at influencing both the US President at the time and European countries.
