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p.s. - The folks who talk the most about the need for the minority upper class to reduce their consumption are the chattering upper classes themselves. Meanwhile, the masses are trying to move up. So what happens when the top 10% reduce their consumption by say 50%, and the remaining 90% increase their consumption by 10% on an annualized basis? A big sucking sound.
Personally, I would feel neither materially nor spiritually gratified to live like a peasant. The goal is to address the world's problems without going backwards.