While we can argue about what needs or doesn't need to be done, it would be foolish to not do what we CAN do. Since I am an old codger (72), I can remember when I lived in California and made some trips from where I lived in SF to LA. I remember the smog being so bad in the 60s and early 70s that soon as I stepped off the plane my eyes would start watering, throat got sore, and the sulphuric smell permeated everything and the yellow cloud hung like a fog bank to the town on bad days. Since they initiated the smog changes....better vehicle emission requirements, smog testing of vehicles, etc. things have gotten dramatically better. Not every thing that was done was the best or most scientific decision, but I don't think anyone who lives in LA would say the air was cleaner than than it is today. And don't forget that smog also caused health issues for many. I remember when one of my daughters went to a convention in Beijing, China in the 90s and came back with stories of the horrible smog there and the same stories of smell, yellow sky, etc. that I related to her. While it is easy to point at the other countries and other people and say they are the problem.....it is everyone's problem. Yes....perhaps it is worse or better than what scientists and politicians say.....but if you have a chance to do something about it today....that is better than waiting until it gets far worse and even more expensive/difficult/impossible to correct. I have kids and grand kids....I don't want to leave them with a world that is worse because we were bad care takers of it during our time on earth.