Dear Umbra, I just took the Ecological Footprint Quiz, feeling rather confident that I've been doing my part to minimize my personal impact on environmental despoliation. But my results weren't reassuring. My ecological footprint is nine acres, which is much better than the U.S. national average of 24 acres per person, but still twice what the planet could sustain. In short, the quiz tells me, if everyone lived like me, we would need two planets. I'm not sure I can make any more big changes -- I take public transportation when I can, I've kept my 10-year-old Honda, which still …
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