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<http://webisa.webdatacommons.org/280208429>	<http://www.w3.org/ns/prov#value>	"ere have been differing scientific estimates of the amount of methane that leaks from wells, pipelines and other facilities during production and delivery." .
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<http://webisa.webdatacommons.org/prov/62537395>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/280208429> .