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Image: Courtesy The Vulcan Project. The units are log(million metric tons/year/100 square km.) The data is drawn from 2002.

Wired tells us that scientists have mapped the carbon emissions across the United States. Known as the Vulcan Project the project has already yielded significant discoveries, here's a snippet,

That means that the NASA- and Department of Energy-funded scientists can detail emissions across all 9 million square kilometers that compose the United States. For a full explanation, check out the video that Purdue's Kevin Gurney put together, which features a number of other excellent CO2 visualizations.