This point was pounded home in a recent EPA study, “Location Efficiency and Building Type—Boiling It Down to BTUs,”11 that compared four factors: drivable versus walkable location; conventional construction versus green building; single-family versus multifamily housing; and conventional versus hybrid automobiles. The study made it clear that, while every factor counts, none counts nearly as much as walkability. Specifically, it showed how, in drivable locations, transportation energy use consistently tops household energy use, in some cases by more than 2.4 to 1. As a result, the most green
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