The Vulcan Project quantifies North American fossil fuel carbon dioxide (CO2) emissions at space and time scales much more precisely than before. While its announced purpose is "...to aid in quantification of the North American carbon budget, to support inverse estimation of carbon sources and sinks, and to support the demands posed by the launch of the Orbiting Carbon Observatory (OCO) scheduled for February 2009..." it also makes it easier for non-scientists to see what the heck is going on.
This has been made much easier due to combining the Vulcan data with Google Earth. This video shows an example:
You may want to get the Google Earth plugin yourself here.