Pollution controls unfortunately are needed. I can remember seeing and smelling rivers here in Tennessee that were so polluted that they were dark brown and devoid of life. I also remember the Tennessee Valley around Knoxville being thick with smog. Today those same rivers are beautiful, and even with many more people, the smog is gone.
Without wading into a political discussion I'll just say that without any controls, the world as we know it would be *frenched.
Finding that fine line between preserving the future for my grandkids and over regulation is something we should strive for rather than using these things as political battering rams.
Remember......this is coming from a guy that hops up engines......