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Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990 – 2018

An emissions inventory that identifies and quantifies a country's anthropogenic1 sources and sinks of greenhouse gases is essential for addressing climate change. This inventory adheres to both (1) a comprehensive and detailed set of methodologies for estimating sources and sinks of anthropogenic greenhouse gases, and (2) a common and consistent format that enables Parties to the United Nations Framework Convention on Climate Change (UNFCCC) to compare the relative contribution of...

Inventory of U.S. greenhouse gas emissions and sinks 1990-2016: Abandoned oil and gas wells

EPA identified and reviewed available emissions data to characterize emissions from abandoned wells, including data from the Kang et al. and Townsend-Small et al. studies. The Kang et al. 2014 study made direct measurements of methane flow rates from 19 wells in Pennsylvania during 2013 and 2014. The wells were not well-documented in state records, so researchers categorized each studied well as plugged or unplugged based on surface observations. The study...