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b. the four wheeler. Assumptions: We're measuring pollution produced by getting one person from point A to point B over a long distance (like Cincinnati to Albuquerque). The choices have the following meanings: Two wheeler: Typical motorcycle (50 mpg) ridden by one person. Four wheeler: Typical passenger car (25 mpg) driven by one person. Railway: Typical Amtrak passenger train measuring pollution per passenger. Plane: Typical airline travel measuring pollution per passenger using most efficient routing. Plane and Railway per passenger values are measured at full capacity (every seat is filled on the train or plane.) Explanation: While locomotives and airliners consume much more fuel and produce more pollution per mile compared to a passenger car or motorcycle, getting 100+ people from point A to point B is still more efficient when they share a plane or train than if they all drove their own cars. Of course, the true amount of pollution produced per person depends on how many people are on the plane or train at any given moment, and what other freight is being carried. I don't know what the load factors are for Amtrak, but full capacity rail is an extremely fuel efficient way to move cargo, human or otherwise. Airliners can vary dramatically in their fuel economy per passenger, but 50 mpg/passenger seat is an easily attainable number.

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16y ago

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