Greenwire: U.S. EPA released a proposed finding today that greenhouse gases threaten public health and welfare, a move that is expected ultimately to trigger broad regulation of those heat-trapping industrial emissions. EPA released the 133-page proposed “endangerment finding” [pdf] in response to a 2007 Supreme Court decision that ordered the agency to reconsider whether greenhouse gases are pollutants subject to regulation under the Clean Air Act. “This finding confirms that greenhouse …