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Science. 2018 Jul 13;361(6398):186-188. doi: 10.1126/science.aar7204. Epub 2018 Jun 21.

Assessment of methane emissions from the U.S. oil and gas supply chain.

Author information

1
Environmental Defense Fund, Austin, TX, USA. ralvarez@edf.org.
2
Environmental Defense Fund, Austin, TX, USA.
3
University of Texas at Austin, Austin, TX, USA.
4
The Pennsylvania State University, University Park, PA, USA.
5
Stanford University, Stanford, CA, USA.
6
Aerodyne Research Inc., Billerica, MA, USA.
7
Harvard University, Cambridge, MA, USA.
8
National Institute of Standards and Technology, Gaithersburg, MD, USA.
9
University of Michigan, Ann Arbor, MI, USA.
10
Washington State University, Pullman, WA, USA.
11
Colorado State University, Fort Collins, CO, USA.
12
Princeton University, Princeton, NJ, USA.
13
University of Colorado, CIRES, Boulder, CO, USA.
14
NOAA Earth System Research Laboratory, Boulder, CO, USA.
15
Carnegie Mellon University, Pittsburgh, PA, USA.
16
Purdue University, West Lafayette, IN, USA.
17
University of Cincinnati, Cincinnati, OH, USA.

Abstract

Methane emissions from the U.S. oil and natural gas supply chain were estimated by using ground-based, facility-scale measurements and validated with aircraft observations in areas accounting for ~30% of U.S. gas production. When scaled up nationally, our facility-based estimate of 2015 supply chain emissions is 13 ± 2 teragrams per year, equivalent to 2.3% of gross U.S. gas production. This value is ~60% higher than the U.S. Environmental Protection Agency inventory estimate, likely because existing inventory methods miss emissions released during abnormal operating conditions. Methane emissions of this magnitude, per unit of natural gas consumed, produce radiative forcing over a 20-year time horizon comparable to the CO2 from natural gas combustion. Substantial emission reductions are feasible through rapid detection of the root causes of high emissions and deployment of less failure-prone systems.

PMID:
29930092
PMCID:
PMC6223263
[Available on 2019-01-13]
DOI:
10.1126/science.aar7204

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