Notes 

1  Most of the estimates in this report are based on activity data and estimated emissions factors, not on measured or metered emissions. 

2  See “Units for Measuring Greenhouse Gases” on page 2, and Intergovernmental Panel on Climate Change, Climate Change 2001: The Scientific Basis (Cambridge, UK: Cambridge University Press, 2001).

3  Sectoral (residential, commercial, and industrial) energy-related carbon dioxide emissions include the share of total electric power sector carbon dioxide emissions that can be attributed to each end-use sector. The share is based on the percentage of total electricity sales purchased by the sector and losses attributed to the sector. (For values used to calculate sectoral shares, see Energy Information Administration, Monthly Energy Review, DOE/EIA-0035, Tables 2.2, 2.3, 2.4, and 2.5, web site www.eia.doe.gov/emeu/mer/consump.html.) All carbon dioxide emissions associated with industrial or commercial enterprises whose primary business is not the production of electricity are allocated to the sectors in which they occur.

4  Data for 2005 military bunker fuels were not available at the time of publication. It should also be noted that only bunker fuels purchased in the United States are subject to adjustment.

5  Based on an estimated GWP of 23 for methane.

6  U.S. Environmental Protection Agency, Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2003, EPA 430-R-05-003 (Washington, DC, April 2005), web site http://yosemite.epa.gov/oar/globalwarming.nsf/content/ResourceCenterPublicationsGHGEmissionsUS EmissionsInventory2005.html. Estimates for carbon sequestration in 2005 are not yet available. 

7  EIA does not include sequestration from land-use change and forestry as part of its annual emissions inventory. 

8  Energy Information Administration, Documentation for Estimation of Greenhouse Gases in the United States 2004, DOE/EIA-0638(2004) (Washington, DC, November 2006), Chapter 8, web site www.eia.doe.gov/oiaf/1605/ggrpt/documentation/pdf/0638(2004).pdf.