FILE - In this Sept. 16, 2014 file photo, United Nations Secretary General Ban Ki-moon participates in a news conference, at United Nations headquarters. More than 120 world leaders convene Tuesday, Sept. 23, for U.N. summit aimed at galvanizing political will for a new global climate treaty by the end of 2015. Environmentalists will take to the streets Sunday, Sept. 20, in what is being billed as the largest march ever on global warming. Celebrities, CEOs and climatologists will appear at a string of events as part of New York Climate Week. DiCaprio has been tapped to talk about the cause of rising seas.(AP Photo/Richard Drew)
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