The EPA has issued a plan for regulating greenhouse gas emissions from fossil fuel power plants and petroleum refineries. Rules for power plants will be made public in July 2011 and for refineries in December 2011. Final standards for each will be announced in May 2012 and November 2012, respectively. The two sources are estimated to account for 40% of total GHG emissions in the U.S. Meanwhile, the chairman of the House Energy and Commerce Committee has unveiled legislation to prevent the EPA from regulating GHG emissions, in response to the proposed rules.