U.S. Greenhouse Gas Inventory by State Methodology Report Archive

Visit the Greenhouse Gas Emissions and Removals page for basic information on the main greenhouse gases and their sources, as well as information on global emissions, national facility-level emissions in the United States, and Individual Emissions (your carbon footprint).

Visit the Methodology Report: Inventory of U.S. Greenhouse Gas Emissions and Sinks by State page to view the most recent state-level greenhouse gas methodology report.

This page contains past versions of the Inventory of U.S. Greenhouse Gas Emissions and Sinks by State developed by the U.S. government. EPA publishes state greenhouse gas (GHG) data consistent with the national Inventory, meaning state GHG totals when summed, will equal national totals in the Inventory of U.S. Greenhouse Gas Emissions and Sinks. This complementary state data is published annually after the national Inventory report. Consistency with the national Inventory also means that state-level estimates adhere to international standards (i.e., consistent with UN transparency system reporting guidelines). State estimates are based on the same methodologies in the national Inventory, cover the same time series as the latest published national Inventory, and cover the same anthropogenic sources and sinks and all seven greenhouse gases. EPA recognizes that a number of states have compiled or are developing their own state-level GHG inventories on a regular or periodic basis. Access official state inventories.

In 2021, the initial methodology report describing methods used to compile the annual publication of national anthropogenic GHG emissions and sinks disaggregated by U.S. state underwent a peer review in addition to a technical review by state experts. View the peer review report and supporting files (zip).

Below is a complete list of past state-level inventory methodology reports:

• Methodology Report for Inventory of U.S Greenhouse Gas Emissions and Sinks by State: 1990-2021 (August 2023) EPA 430-R-23-003
• Methodology Report for Inventory of U.S Greenhouse Gas Emissions and Sinks by State: 1990-2020 (August 2022) EPA 430-R-22-005
• Methodology Report for Inventory of U.S Greenhouse Gas Emissions and Sinks: 1990-2019
  (March 2022) EPA 430-R-22-001