Complete Vulcan CO2 emissions after it has been gridded to the common 10 km x 10 km Vulcan grid. The units are log base 10 of million metric tons of carbon/gridcell/year. Total US fossil fuel CO2 emissions for 2002 come to 1506 million metric tons of carbon/year. This is slightly lower than Energy Information Estimates (1580 MtC/year) due to the missing nonroad and aircraft emissions in the Vulcan inventory. The Vulcan Project is a NASA/DOE funded effort under the NACP to quantify North American CO2 emissions at space and time scales much finer than has been achieved in the past. The 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 Orbital Carbon Observatory (OCO) scheduled for 2008/2009. The detail and scope of the Vulcan CO2 inventory has also made it a valuable tool for policymakers, demographers and social scientists.The Vulcan project has achieved the quantification of the United States fossil fuel CO2 emissions at the scale of individual factories, powerplants, roadways and neighborhoods.