Dear Umbra, Your recent column suggested that the questioners sell one of their two cars, but I can't help wondering how much good that does for the environment, especially weighed against the annoyance cost of not having a second car when two people have to be going in opposite directions at the same time. I have a personal interest in this, as we have three cars: mine (a Prius, used for all errands and most weekend driving), his (for commuting), and ours (a four-wheel-drive minivan, which we use when we have too many people or too much stuff for the …
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