Inventory of U.S. Greenhouse Gas Emissions and Sinks (1990-2006) from the U.S. EPA

The U.S. Environmental Protection Agency (EPA), Office of Air and Radiation has
produced an emission inventory that identifies and quantifies the U.S. primary
anthropogenic sources and sinks of greenhouse gas (GHG) emissions. The data
covers anthropogenic emission trends from 1990-2006 and ensures that the U.S.
emissions inventory is comparable to the United Nations' Framework Convention
on Climate Change (FCCC) signatory countries according to methodologies similar
to those recommended in the Revised 1996 IPCC (Intergovernmental Panel on
Climate Change) Guidelines for National Greenhouse Gas Inventories
(IPCC/UNEP/OECD/IEA 1997).

The greenhouse gases in the inventory include carbon dioxide (CO2),
methane (CH4), nitrous oxide (N2O), and ozone (O3). Also included are
the halocarbons chloroflurocarbons (CFCs) and hydrochloroflurocarbons
(HCFCs) and hydroflurocarbons (HFCs), perflurocarbons (PFCs), and
sulfur hexafluride (SF6). Emissions of gases that do not directly
affect global warming, but are instrumental in the destruction of
ozone include: carbon monoxide (CO), oxides of nitrogen (NOx), and
nonmethane volatile organic compounds (NMVOCs) as well as aerosols
produced by the emissions of sulfur dioxide (SO2). The data in the
inventory also includes calculations of global warming potentials
(GWPs) that directly or indirectly contribute to the greenhouse
effect.

Inventory emissions are determined from the following sources: energy
sector (including fossil fuel combustion, cement manufacture, and
natural gas flaring), industrial processes, land-use change and
forestry, agriculture sector (including methane and nitrous oxide
emissions from enteric fermentation in domestic livestock, manure
management, soil management, and rice cultivation), waste management
activities, and solvent use.

The inventory is available on the WWW at:
http://yosemite.epa.gov/oar/globalwarming.nsf/content/EmissionsNational.html