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			 The White House is seeking to enshrine its pledge in a global 
			climate agreement to be negotiated Nov. 30 to Dec. 11 in Paris. It 
			calls for cutting greenhouse gas emissions by close to 28 percent 
			from 2005 levels within a decade, using a host of existing laws and 
			executive actions targeting power plants, vehicles, oil and gas 
			production and buildings. 
			 
			But Republican critics say the administration lacks the political 
			and legal backing to commit the United States to an international 
			agreement. 
			 
			"Considering that two-thirds of the U.S. federal government hasn't 
			even signed off on the Clean Power Plan and 13 states have already 
			pledged to fight it, our international partners should proceed with 
			caution before entering into a binding, unattainable deal,” Senate 
			Majority Leader Mitch McConnell said. 
			 
			U.S. officials stressed that their Intended Nationally Determined 
			Contribution, U.N. lingo for its official submission, stands on 
			sound legal footing, with the measures drawing authority from 
			legislation such as the Clean Air Act and the Energy Independence 
			and Security Act. 
			
			  Todd Stern, the lead U.S. climate change negotiator, said he 
			frequently tells foreign counterparts that "undoing the kind of 
			regulation we are putting in place is very tough to do." 
			 
			But elements of the administration's climate policy already face 
			legal challenges. On April 16, a federal appeals court in 
			Washington, D.C. will hear arguments from 13 states opposed to 
			as-yet-unfinalized regulations from the Environmental Protection 
			Agency (EPA) that target emissions in existing power plants. 
			 
			And McConnell's warnings echoed the tone of a March 9 "open letter" 
			from 47 Republican senators to Iran, in which they warned a 
			Republican president would not be bound to honor a nuclear agreement 
			struck by Democrat Obama without congressional approval, calling it 
			a "mere executive agreement." 
			 
			Some observers said that resistance to the administration's climate 
			policies leaves foreign governments questioning whether Obama's 
			commitments can last. 
			 
			“By strenuously invoking EPA regulations, the Administration is 
			trying to convince skeptical international audiences that the U.S. 
			can actually deliver on its new climate goals, despite Republican 
			resistance,” said Paul Bledsoe, a former Clinton White House 
			official who is now with the German Marshall Fund of the United 
			States. 
			 
			“But major capitals are likely to remain nervous.” 
			 
			
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			The administration is clearly sensitive to the threat. Power plants 
			are the biggest domestic source of greenhouse gas emissions, and the 
			EPA is seeking to use its power to slash carbon levels from plants 
			to 30 percent of their 2005 levels by 2020. 
			 
			On Monday, EPA Administrator Gina McCarthy said the agency had 
			designed power plant rules under the authority of the Clean Air Act 
			- and insisted that they can withstand Supreme Court scrutiny. 
			 
			"We don’t need a plan B if we are solid on our plan A," she said. 
			 
			But Jeff Holmstead, a lawyer representing utilities industries for 
			Bracewell & Giuliani and former assistant administrator of the EPA 
			under George W Bush, says even if the courts uphold the EPA proposal 
			on power plants, a future Republican administration can reverse it. 
			 
			"There are some EPA rules that are very difficult for a new 
			administration to change but this is not one of those rules," 
			Holmstead said. He calculates that at least five high court justices 
			are wary of the EPA's regulatory leeway. 
			 
			Environmental groups, on the other hand, were more confident that 
			Obama's measures cannot be reversed by the courts or politics. 
			 
			“The Clean Air Act has proven to be quite durable," said David 
			Waskow, director of international initiatives for the World 
			Resources Institute. "While elements may be slowed or modified by 
			legal challenges, they are rarely overturned.” 
			 
			(Reporting By Valerie Volcovici; Editing by Bruce Wallace and Grant 
			McCool) 
			
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