Salon: In 2001, Scott Bernstein, at the Center for Neighborhood Technology in inner-city Chicago, produced a set of maps that are still changing the way we think about our country. In these maps, remarkably, the red and the green switched places. This reversal, perhaps even more than the health discussion, threatens to make walkability relevant again.
By red and green, I am referring to carbon emissions. On typical carbon maps, areas with the greatest amount of carbon output are shown in bright red,…

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