shale http://wyomingpublicmedia.org en CDC scientist says tests are needed on gas drilling impact http://wyomingpublicmedia.org/post/cdc-scientist-says-tests-are-needed-gas-drilling-impact <p>One of the government&#39;s top scientists says much more research is needed to determine the possible impacts of shale gas drilling on human health and the environment.</p><p>Dr. Christopher Portier of the federal Centers for Disease Control and Prevention says studies should include all the ways people can be exposed, such as through air, water, soil, plants and animals.</p><p>Portier says there isn&#39;t currently enough information to say with certainty whether shale gas drilling poses a threat to public health.</p> Thu, 05 Jan 2012 13:05:30 +0000 The Associated Press 17593 at http://wyomingpublicmedia.org CDC scientist says tests are needed on gas drilling impact