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Using direct measures of emissions from devices on 377 wells operated by 10 companies cooperating on the survey, Allen gathered data that reshaped the EPA’s pie chart of E&P emissions of methane. The study concluded that emissions during flowback have sharply dropped from 26% in the EPA’s Greenhouse Gas Inventory to 1%. That decline, plus larger-than-expected emissions by gas-powered pneumatic control devices, pushed its share of the natural gas emissions from the EPA estimate of 26% to 42%, making it the largest single category. | Using direct measures of emissions from devices on 377 wells operated by 10 companies cooperating on the survey, Allen gathered data that reshaped the EPA’s pie chart of E&P emissions of methane. The study concluded that emissions during flowback have sharply dropped from 26% in the EPA’s Greenhouse Gas Inventory to 1%. That decline, plus larger-than-expected emissions by gas-powered pneumatic control devices, pushed its share of the natural gas emissions from the EPA estimate of 26% to 42%, making it the largest single category. | ||
[[File:Wellsite emissions graph.jpg| | [[File:Wellsite emissions graph.jpg|frame|576x305px|Two 2015 studies of wellsite emissions showed a rapid drop in methane emissions from water flowing back after fracturing, increasing the relative importance of emissions by well equipment.|link=http://petrowiki.org/File%3AWellsite_emissions_graph.jpg]] | ||
== Reducing methane emissions == | == Reducing methane emissions == |