As to the pollution problem...ever think about how much pollution a single trip cross country in a 727 makes?

How about the fact that most trains leak more oil in an hour than a two stroke bicycle motor will use in it's entire service life.

Or all those idling police cars?

Ever follow a garbage truck? City bus? Big Dodge Ram diesel?

Or what about all that smoke that comes out of the top of a Bogus King restaurant?

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If it ain't broke, and you mess with it long enough, it will be.