|
 |
|
Please see EPA's Climate Change site for current information on climate change and global warming. EPA no longer updates EPA's Global Warming Site, but is maintaining this archive for historical purposes. Thank you for visiting the archive of EPA's Global Warming Site.
Energy CO2 Inventories
| |
This section provides state carbon dioxide emission inventories from fossil fuel combustion. The inventories present annual emissions of CO2 by sector (commercial, industrial, residential, transportation and electric utilities) in million metric tons of carbon dioxide (MMTCO2) from 1990 though 2002.
Download State Energy CO2 Data
The tables are available for viewing in Adobe Acrobat format or in Microsoft Excel format for spreadsheet analysis. Acrobat reader is available from Adobe Systems  at no cost.
Notes on Units and Methods
The principal GHGs are carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Because these gases differ in their ability to trap heat, one ton of emissions of CO2 has a different effect than one ton of emissions of CH4. To express emissions of the different gases in a comparable way, atmospheric chemists often use a weighting factor called global warming potential. The heat-trapping ability of one metric ton (1,000 kilograms) of CO2 is taken as the standard, and emissions are expressed in terms of millions of metric tons of CO2 equivalent (MMTCO2E). In state-authored greenhouse gas inventories, emissions are expressed in terms of million metric tons of carbon equivalent (MMTCE). Carbon comprises 12/44 of the mass of carbon dioxide; thus to convert from CO2 equivalent to carbon equivalent, multiply by 12/44. For more information on global warming potential and energy conversion factors, see the Introduction (325 KB PDF) and Annex 6 (265 KB PDF) of the US Emissions Inventory 2006.
EPA developed the inventories using (1) fuel consumption data from the DOE/EIA State Energy Data 2002 Consumption tables and (2) emission factors from the US Emissions Inventory 2006. EPA's data may differ slightly from state-authored inventories because of methodological differences, including scope of coverage, underlying data, emission factors, or assumptions.
| |
|
|