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Natural gas and petroleum systems contribute around 30% of national methane emissions in the Inventory of U.S. Emissions and Sinks (GHG Inventory). EPA quantifies these emissions using detailed activity and emissions data on equipment and practices across the U.S. In this talk, I will discuss EPA’s methods for calculating emissions in the GHG Inventory and our approach for updating estimates with new data.

Melissa Weitz is a physical scientist in EPA’s Office of Atmospheric Programs where she focuses on quantification of methane emissions from oil and gas systems for the Inventory of U.S. Greenhouse Gas Emissions and Sinks. She is a Lead Reviewer for Annex I GHG Inventories for UNFCCC and was a Coordinating Lead Author for the Energy volume of the 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories.