![[logo] US EPA](http://www.epa.gov/epafiles/images/logo_epaseal.gif){kind=logo}
- State and Local Emissions
- Energy CO2 Emissions by State
- State Greenhouse Gas Inventories
- Resources for Inventory Development
Comparison of State-Level CO2 Estimates and the Inventory of U.S. Greenhouse Gas Emissions and Sinks
The state-level CO2 estimates differ slightly from the estimates of CO2 from fossil fuel combustion found in the Inventory of U.S. Greenhouse Gases and Sinks. The methodological differences between the two inventories are discussed below.
- U.S. Territory CO2 emissions are included in the U.S. Inventory's national emissions totals, but not in the state-level CO2 estimates.
- Emissions from fuels used for international transport (bunker fuels) are not included in the Inventory of U.S. Greenhouse Gas Emissions and Sinks totals; however, they may be included in the state-level CO2 emissions totals. Since bunker fuel data is not provided from the DOE/EIA on a state-by-state basis, this subtraction can only be made at the national level. In some cases, individual states have data on bunker fuel consumption, and have used this data in their state-authored inventories.
- Small adjustments are made to certain fuel categories in the Inventory of U.S. Greenhouse Gas Emissions and Sinks to reduce the chances of double counting. Not all of these adjustments are made in the state-level data due to either a lack of state-level data or the very small impact such adjustments would make to total emissions. Examples include subtractions made from natural gas to account for refined landfill methane used for fuel and subtractions made from natural gas used in ammonia production.
- The U.S. Inventory reports emissions from fuels used for non-energy uses (NEU) separately from fuel combustion estimates. While the State Inventory Tool does not report emissions from NEU separately, the State Inventory Tool still uses the accepted method of subtracting only the carbon stored from total fossil fuel carbon, and results in including NEU emissions in the estimates of CO2 from fossil fuel combustion.