Not to sound too cynical, but humanity has rarely (or ever) been able to react in a coordinated timely fashion to any event threating it in any way.

That is until we reach the brink.

Think of the Montreal Protocol from the 80's, a treaty for phasing out and eventually banning CFC/HCFC's in an effort to protect and hopefully restore the ozone layer. The protocol was in response to a dramatic seasonal depletion of the ozone layer over Antarctica in the 80's.

To me, from everything I read and hear about PFAS pollution, it would seem we are at the brink again in terms of those chemicals.