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Head of the U.N. Intergovernmental Panel on Climate Change, Rajendra Pachauri, addresses a news conference at the European Parliament in Brussels March 26, 2008. (Francois Lenoir/Reuters)AP - With the presidential election less than a month away and the economy reeling, House Democratic leaders on Tuesday unveiled a proposal to reduce the gases blamed for global warming from power plants, transportation and factories by 80 percent come 2050.