"Greenest" should be fairly obvious, no? Dense cities have the lowest carbon footprint per capita. See the chart in this article: https://www.brookings.edu/arti

"Greenest" should be fairly obvious, no? Dense cities have the lowest carbon footprint per capita. See the chart in this article: https://www.brookings.edu/articles/its-not-just-cities-suburbs-and-exurbs-need-to-adopt-and-implement-climate-plans-too/ https://www.brookings.edu/articles/its-not-just-cities-subur... And while commuting might account for some fraction of the added footprint, larger houses mean more heating/cooling and larger sprawl means someone is driving to deliver daily essentials (grocery, gas, medicines, teaching, cleaners etc).