I'm definitely in the "Limit emissions" group. I grew up in the 60's and 70's in the Burlington, Vt. area. That was when smog started to hit.
From about 6th grade on the school I was in in Essex Center would take the "upper grades" to Ethan Allen Park for a beginning of the summer field trip. The park
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has a neat "fort" and the view from the top gives a LONG look down the Champlain Valley.
As soon as we were old enough we would climb up to the top and look down the valley. As I grew older the view was decreased by pollution. By the early 1970's during periods of calm air in the summer we could actually see like a fog of pollution rolling up the valley.
Then I joined the Army in '75, moved to Northern Virginia. Air pollution down here was so bad that we started having "smog days" by about 1979. Then it got better for a LONG time due to emissions equipment on cars.
What I think is unfair about all the emissions stuff is that I can run my 7.3L F350 (15MPG) and pollute all over, but if my Escape (~30MPG) burps it may not pass emissions.