![]() ![]() Using these measurements, along with EPA data from other segments of the natural gas supply chain, the study found an overall leakage rate that EDF’s Mark Brownstein noted is a “well below what most scientists say is advantageous for the climate.” (Leakage rate: 1.6 percent): This 2015 EDF/Colorado State University study took direct measurements from 114 gathering stations and 16 processing plants across 13 states. (Leakage rate: 1.2 percent): Using “top down” measurements from aircraft over the Barnett Shale in Texas, this 2015 EDF/University of Houston study found very low leakage rates, despite the fact that a limitation of “top down” studies is the fact that methane detected can come from other sources such as agriculture and natural seeps. relied on air measurements likely collected during episodic maintenance events, which skewed emissions higher than they typically would be. A recent NOAA study also reveals the “super-emitter” data Zavala-Araiza et al. But even though the study finds low emissions, it is worth pointing out that it likely overestimates the leakage rate based to the fact that it extrapolates so-called “super-emitter” data from Zavala-Araiza et al. (see below) to synthesize emissions on a national scale. Department of Energy National Energy Technology Laboratory study used data from Zavala-Araiza et al. (Leakage rate: 1.65 percent): This 2017 U.S.
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