FILE - In this Dec. 18, 2013 file photo, then-Mayor Michael Bloomberg speaks in New York. Bloomberg has been chosen by Secretary-General Ban Ki-moon to be a U.N. envoy for cities and climate change, U.N. diplomats said Friday, Jan. 31, 2014 The billionaire businessman and philanthropist turned politician made combating climate change a major focus of his 12 years as mayor. He was also very outspoken on how cities should be run to cope with ever increasing populations. (AP Photo/Bebeto Matthews, File)
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