This section of the EPA Global Warming Site provides information on state GHG emission inventories, trends in emissions of GHGs and related pollutants, and methodological guidance.
EPA helps states prepare GHG inventories by providing inventory guidance, a spreadsheet-based analytical tool and technical asssistance. States use their inventories to quantify their emissions, measure changes in GHG emissions, and identify potential GHG reduction opportunities.
It is organized into the following subsections:
State GHG Inventories – 41 states have developed their own GHG inventories, in partnership with EPA. Each inventory identifies the major sources of GHG emissions and presents annual emissions by sector (e.g., energy, agriculture, waste), by source (e.g., transportation emissions, manure management), and by gas (e.g., carbon dioxide, methane). In addition, EPA has developed state inventory summaries that reflect the most recent inventory guidance.
Energy CO2 Inventories – Provides estimates of carbon dioxide emissions from fossil fuel combustion, calculated by using fuel consumption data from State Energy Data Reports compiled by the U.S. Department of Energy, Energy Information Administration.
Inventory Guidance – Provides guidance on methods and data for developing inventories of GHG emissions and sinks.
Additional information on greenhouse gases and related air pollutants at the state level is available on other EPA sites:
- EPA's Green Book provides a status report on the areas of the United States that exceed the National Ambient Air Quality Standards (NAAQS) for ozone and particulate matter (PM). Many of the principal sources of conventional air pollutants are key sources of GHGs as well.
- EPA's Emissions Scorecard 2001 provides electric utility emissions data for SO2, NOx, and CO2 as reported to EPA's Acid Rain Program. State-by-state summaries of utility-reported emissions data for 1980, 1985, 1990, and 1995-2000 are available for download in PDF, Microsoft Excel, or tab-delimited text formats. Efforts to control acid rain can produce a number of such "co-benefits" by reducing or offsetting greenhouse gas emissions. For example, certain x abatement technologies also reduce nitrous oxide, a powerful greenhouse gas.