It’s curious, in the chaos of conversations about what we ought to do to save the world, how seldom sheer modesty comes up — living smaller, staying closer, having less — especially for us in the ranks of the privileged. Not just having a fuel-efficient car, but maybe leaving it parked and taking the bus, or living a lot closer to work in the first place, or not having a car at all. A third of carbon-dioxide emissions nationwide are from the restless movements of goods and people.

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LONG AGO the poet and bioregionalist Gary Snyder said, “The most radical thing you can do is stay home.”