I agree that we need to be conscious of mankinds effect on the world around us, and we should try to pollute as little as possible, but the USA has made great progress in that regard.
However, until countries like China, India, etc., who pollute at a rate much greater than the USA, are brought in line, it is like peeing in a windstorm.
Do I believe China, India, etc. will ever do this? No, absolutely not.
I hope the v8 makes a comeback, time will tell.
Mother nature was here long before us, and will be here long after us, and in spite of us.