You can't put it up in the West Wing
Image courtesy of The Vulcan Project
The map is cute, and the raw data is invaluable, but the visualization is worthless. As it is, this map does not look any different than one depicting population density.
Needed is a visualization corrected for population, thus showing carbon footprint per capita. Even better would be a map corrected for GDP, thereby depicting carbon per unit of economic output.
Otherwise, what is the policy prescription derivable from this thing? Hey, Northeastern Corridor! If you ditch your population and your jobs, you can be as pollution-free as Montana!