For those of us who can remember the 70's, air pollution was a huge problem. Interesting that it took Canada threat to ban US imports to get the US to take action. The air in LA was famously a thick dark brown. Car exhaust was deadly yet we all had to breath it everyday.
   I don't want to return to that, I want to continue to make strides in a cleaner world. If we could have our government support alongside what we all do individually, we can make a change. The 1970's showed it was possible.