Impossible (outside of some small projects that tinker around the edges in beneficial ways, but can never do enough to put a substantial dent in the problem).

The problem comes down to something that's literally taught in economics 101: negative externalities. The cost to society of polluting is put on society, and not on the company actually causing that cost. There needs to be change in the legal situation so that doing the socially good thing is also the profitable thing. Whether that's taxes or outright banning polluting, or something else.