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I'm amused by the assumption that you have to own a car.
Once you think you have to own a car, the SUV -- the Hummer -- indeed, the Sherman tank follow logically. You're already in prison and the only question is the size of the bars. Some people like big bars, some people like little bars. Everyone likes looking down on the people who have a different size of bar.
OK, so go polish your bars. Don't worry about saving the planet -- you're a helpless prisoner and someone else will have to do it.