There needs to be a caveat here, though. Density is a plus word today, and it’s often said that New York’s Manhattan is the greenest community in the U.S., because its high density leads to low per-capita consumption of energy for heating, cooling, and transit. But throw the frame a little wider, and you realize that a lot of the food for New York is coming in carbon-powered trucks and airplanes from California, or even Brazil or China. Maybe there’s a more optimal city size, one that would permit us to raise more food nearer home.
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