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38" boggers and a 454 do more damage than Joe Commuter and his honda ever will.
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Multiply Joe Commuter by about 10,000, then 10 times that (10 trips to work and back a week) and you might have the ratio of commutes to wheeling trips. No way in hell one 4 wheeler makes as much of an environmental impact (that is reversible with time don't forget) with his big tires and large engine as do 100,000 commutes, whether you are measuring air pollution, rubber left on the road, or what have you.
I certainly don't see smog up in the mountains when I go up there, regardless of how many people are out driving their rigs, nor do I see ORV areas tested for air quality, except Yellowstone. Joe commuter likes to think that hes not harming the environment, and loves to blame everyone else, but it's his 100 miles a week (multiplied by the millions of others doing the same thing) that are doing the most damage. It's real easy to be a hypocrite.