National Greenhouse Gas Emissions Data
Natural Gas Systems
- On November 8, 2013 EPA proposed an update to its methodology in the Inventory of U.S. Greenhouse Gas Emissions and Sinks for hydraulically fractured gas well completions and workovers, and is requesting stakeholder feedback by November 22, 2013. More Information >>
- Overview of Updates to the Natural Gas Sector Emissions Calculations for the Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2011 (PDF) ( 3 pp., 64 KB)
- On February 27, 2013 EPA held a technical webinar on natural gas systems in the Greenhouse Gas Reporting Program (GHGRP) and the Inventory of U.S. Greenhouse Gas Emissions and Sinks (Inventory). View speaker presentations and learn more about the webinar.
- On September 13-14, 2012, EPA held a stakeholder workshop on key aspects of the estimates of greenhouse gas emissions from the natural gas sector in the Inventory of U.S. Greenhouse Gas Emissions and Sinks. View speaker presentations and learn more about the workshop.
EPA develops an annual report called the Inventory of U.S. Greenhouse Gas Emissions and Sinks (Inventory). This report tracks total annual U.S. emissions and removals by source, economic sector, and greenhouse gas going back to 1990. EPA uses national energy data, data on national agricultural activities, and other national statistics to provide a comprehensive accounting of total greenhouse gas emissions for all man-made sources in the United States. EPA also collects greenhouse gas emissions data from individual facilities and suppliers of certain fossil fuels and industrial gases through the Greenhouse Gas Reporting Program. The most recent Inventory report is available for download at the bottom of this page.
The national greenhouse gas inventory is submitted to the United Nations in accordance with the Framework Convention on Climate Change . In preparing the annual emissions inventory report, EPA collaborates with hundreds of experts representing more than a dozen U.S. government agencies, academic institutions, industry associations, consultants and environmental organizations.
For an overview of greenhouse gas emissions in the United States based on information from the Inventory including graphs of U.S. emissions by gas and source, click on the links below:
INVENTORY OF U.S. GREENHOUSE GAS EMISSIONS AND SINKS: 1990-2012
The Inventory of U.S. Greenhouse Gas Emissions and Sinks tracks the national trend in greenhouse gas emissions and removals back to 1990. The key findings of the 1990-2012 U.S. Inventory include:
- In 2012, U.S. greenhouse gas emissions totaled 6,526 million metric tons CO2 Eq.
- U.S. emissions decreased by 3.4 percent from 2011 to 2012. Recent trends can be attributed to multiple factors including reduced emissions from electricity generation, improvements in fuel efficiency in vehicles with reductions in miles traveled, and year-to-year changes in the prevailing weather.
- Greenhouse gas emissions in 2012 were 10 percent below 2005 levels.
Read or download the entire Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2012 (PDF, 529 pp., 12.6 MB). For faster access, individual report sections are posted below, for example the Executive Summary (PDF, 27 pp., 1.10 MB).
Individual sections of the report are also available for download:
Upfront (PDF) (5 pp., 351 KB) - Includes title page, acknowledgments and preface.
Table of Contents (PDF) (17 pp., 531 KB) - Contains the main inventory document's table of contents as well as the list of tables, figures, and boxes.
Executive Summary (PDF) (27 pp., 1.10 MB) - Provides a broad overview of all U.S. greenhouse gas emission sources and sinks, introduces key concepts and discusses the primary drivers for changes in emissions. All material in the Executive Summary is drawn from the following chapters.
Introduction (PDF) (23 pp., 816 KB) - Includes background information on greenhouse gas emission inventories, an introduction to climate change, a discussion of methodological issues and plans for QA/QC and an uncertainty analysis.
Trends in Greenhouse Gas Emissions (PDF) (33 pp., 1.45 MB) - Provides an overview of emission trends and discusses the primary drivers for changes in emissions.
Energy (PDF) (82 pp., 2.21MB) - Discusses and quantifies energy related emissions of all greenhouse gases resulting from stationary and mobile source activities including fuel combustion and fugitive fuel emissions.
Industrial Processes (PDF) (103 pp., 1.93 MB) - Addresses emissions from industrial processes not directly related to energy activities.
Solvent and Other Product Use (PDF) (5 pp., 513 KB) - Addresses emissions resulting from the use of solvents and evaporative emissions of greenhouse gases arising from other types of product use.
Agriculture (PDF) (42 pp., 1.70 MB) - Addresses anthropogenic emissions from agricultural activities (not including fuel combustion and sewage emissions, which are addressed in the Energy and Waste chapters).
Land Use, Land-Use Change, and Forestry (PDF) (82 pp., 3.46 MB) - Addresses emissions and removals from forest and land-use change activities, primarily carbon dioxide.
Waste (PDF) (32 pp., 1.01 MB) - Addresses emissions from waste management activities.
Other (PDF) (1 pp., 203 KB) - Addresses emissions from the "Other" IPCC sector.
Recalculations and Improvements (PDF) (6 pp., 509 KB) - Includes an overview of changes in this year's report, including historical data, methodology and other changes relative to the 1990-2011 report.
References (PDF) (63 pp., 899 KB) - Contains the list of references used in the main inventory document.
All Annexes (PDF) (453 pp., 14.2 MB) - Supplementary information, data tables, detailed emission calculations and methodological discussions.
Annex Introduction and TOC (PDF) (1 pp., 212 KB) - Contains the table of contents for the Annex.
Annex 1 (PDF) (25 pp., 1.04 MB) - Key Category Analysis.
Annex 2 (PDF) (98 pp., 2.05 MB) - Methodology and Data for Estimating CO2 Emissions from Fossil Fuel Combustion.
Annex 3 (PDF) (260 pp., 6.71 MB) - Methodological Descriptions for Additional Source or Sink Categories.
Annex 4 (PDF) (10 pp., 392 KB) - IPCC Reference Approach for Estimating CO2 Emissions from Fossil Fuel Combustion.
Annex 5 (PDF) (2 pp., 225 KB) - Assessment of the Sources and Sinks of Greenhouse Gas Emissions Not Included.
Annex 6 (PDF) (24 pp., 667 KB) - Additional Information.
Annex 7 (PDF) (29 pp., 664 KB) - Uncertainty.
Annex 8 (PDF) (4 pp., 351 KB) - QA/QC Procedures.