| http://www.w3.org/ns/prov#value | - However, this remains subject to debate.???Reviewing US medical research, the health body said potential risks from exposure to benzene, ethylbenzene and other chemicals are highest for those living within a half-a-mile of a drilling site ??? but it warned that the US research is ???limited??? in its usefulness.???Control of emissions from shale gas extraction and related activities will be of cen
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