I've been around a long time and I love the old stuff also, but I don't necessarily believe that the "pollution factor" is as serious or as critical as it is being opined about by the "tree huggers." More can be done by the refiners to brew far cleaner burning fuel. A properly tuned engine is also the key to cleaner runs. I'm a pilot and I have been so since 1965. The only "physical" impact on the environment I have observed over the years, is the haze is not as pronounced as it was in the 70s-80s and 90s. The land scape is greener. So, I know we are doing something better, however, here is the "rude truth." We as a nation can make all of the changes being demanded by the huggers, but if you think for one moment, countries like China, India, and ALL of the third world countries are going to give up the "ICE" because the huggers demand they do...It ain't gonna happen.