"Energy-related carbon dioxide, including emissions resulting from nonfuel uses of energy fuels (primarily petroleum) and adjustments for U.S. Territories and international bunker fuels, account for 98 percent of all United States carbon dioxide emissions."
Emissions of Greenhouse Gases Report
Report #: DOE/EIA-0573(2006)
Released Date: November 28, 2007
This includes the transportation sector. Electricity production accounts for roughly 1/3 of all US green house gas emissions.