An analysis of a number of hydraulic fracturing sites in southwestern Pennsylvania has found that methane was being released into the atmosphere at 100 to 1,000 times the rate that the Environmental Protection Agency estimated. The study, published Monday in the Proceedings of the National Academy of Sciences, found that drilling operations at seven well pads emitted 34 grams of methane per second, on average, much higher than the EPA-estimated 0.04 grams to 0.30 grams of methane per second. The researchers, who were attempting to understand whether airborne measurements of methane aligned with estimates taken at ground level — the method commonly used by the EPA and state regulators — flew a plane over the region of the Marcellus Shale for two days in June 2012. thinkprogress.org/climate/2014/04/15/3426697/methane-vastly-underestimated/ DA
Posted on: Wed, 30 Apr 2014 16:25:57 +0000
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