Letting the free market handle things works, IF your only goal is economic. And while that is important, there are bigger pictures to worry about. Like, preserving a habitable planet.
yes because we can undo china and india's record breaking smog and pollution. /s
Assuming manufacturing got moved back to America then yes, it can be solved.
Even if not, giving up on doing the right thing just because other countries aren't helping is a very short-sighted approach to worldwide leadership. We can lead the efforts towards a better world.