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			 Barring any last minute changes, U.N. Secretary-General Ban 
			Ki-moon — who is seeking to re-energize the global climate change 
			debate and boost the United Nations' role — could make the 
			announcement as early as Friday, the sources said on the condition 
			of anonymity. 
 			Bloomberg, a billionaire philanthropist who left office last month, 
			made combating climate change a key focus during his 12 years 
			leading the United States most populous city. He also advocated for 
			national climate change legislation. 
 			Bloomberg has played a leading role in the C40 Cities Climate 
			Leadership Group, an international group of mayors created in 2005 
			and dedicated to reducing greenhouse gas emissions. The C40 group, 
			of which Bloomberg is president of the board, is due to meet in 
			Johannesburg next week. 
 			He announced last month that New York City's greenhouse gas 
			emissions have dropped by 19 percent since 2005, putting the city 
			nearly two-thirds of the way to meeting the goal that he set five 
			years ago. 			
			  
 			In the climate change blueprint he launched in 2007, called PlaNYC 
			2030, Bloomberg set a goal to slash citywide emissions 30 percent by 
			2030 through a number of initiatives, such as requiring hybrid taxi 
			cabs, building bike lanes and retrofitting municipal buildings to 
			make them more energy efficient. 
 			Bloomberg pledged to continue focusing on promoting his key causes — combating climate change, gun control and immigration — after 
			leaving office through his philanthropic work. 
 			The United Nations will host a one-day climate change summit in New 
			York on September 23, 2014. Many developing nations want it to be a 
			deadline for rich countries to outline planned cuts in greenhouse 
			gases beyond 2020 as a key step towards a global climate deal in 
			2015. 
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			Last month, Ban appointed former Ghana President John Kufuor and 
			former Norwegian Prime Minister Jens Stoltenberg as special envoys 
			on climate change to drum up support for the planned September 
			conference. 
 			Ever since the 2009 U.N. climate summit in Copenhagen failed to 
			secure a deal on a binding treaty on reducing carbon emissions, the 
			United Nations has been sidelined, U.N. diplomats and officials say. 
 			Climate discussions have shifted away from the world body to 
			bilateral talks between key world powers and the Group of 20 club of 
			major developed and developing nations. 
 			But Ban has long seen galvanizing support for global action on 
			climate change as key to his legacy as secretary-general, the 
			officials and diplomats say, and is eager to restore the United 
			Nations' relevance to the climate negotiations. 
 			(Additional reporting by Louis Charbonneau; 
editing by Bernard Orr) 
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