An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Greenhouse Gas Emissions

Stakeholder Process for Natural Gas and Petroleum Systems in the 1990-2018 Inventory

It is EPA's standard process to update the Inventory of U.S. Greenhouse Gas Emissions and Sinks (GHG Inventory) when relevant new and improved data are available.

EPA held stakeholder webinars and meetings on updates under consideration for the 1990-2018 GHG Inventory (released in 2020). Information for each webinar and meeting is posted here.

November 7, 2019 Workshop

On November 7, 2019, EPA held a stakeholder workshop on EPA’s GHG data for natural gas and petroleum systems from the Greenhouse Gas Reporting Program (GHGRP) and GHG Inventory. The workshop took place in Pittsburgh, PA.

At the workshop, EPA presented on GHGRP data, and on existing GHG Inventory methods and updates under consideration based on previous stakeholder comments and data from the GHGRP and external studies.

Stakeholders also presented new data and information relevant to estimating GHG emissions from natural gas systems and petroleum systems.

View supporting materials.

September 12, 2019 Webinar

On September 12, 2019, EPA held a stakeholder webinar focusing on offshore oil and gas production updates under consideration for the 1990-2018 GHG Inventory.

View supporting materials.

Additional Information

Access prior year stakeholder outreach documents for updates to the methods and data used for GHG emission estimates for natural gas and petroleum systems.

See additional information on oil and gas estimates in the 1990-2017 GHG Inventory (published April 2019).