In my opinion I don't think the majority of America could care less about automotive emmisions. Look at the racing industry we have, stock cars, drag cars, power boats, nuff said there. Then you have the gas guzzling vehicles we drive and don't seem to want to give up any time soon, not to mention the driving habits of going one block to get a gallon of milk when a brisk walk would have been better for all.
Sorry to stray from the topic but there is a lot of hypochracy going on in this day and age.