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What specific forms of pollution besides transportation and home energy use do you think are important here? Humans are mainly polluters by virtue of our homes and cars, which a lot more intense in decentralized environments.

Suburbanites are at very high risk of life-altering consequences from the actions of other humans. Many of those actions are crimes (DUI, distracted driving, reckless driving), but worse, some are not even crimes (incompetent driving, tired driving, intentional killing of annoying cyclists). That we feel so differently about these compared to more traditionally urban forms of crime is just cognitive bias with a helping of racism.