U.N. Secretary-General Ban Ki-moon addresses delegates at the opening of the High-level Segment of the U.N. Climate Conference in Warsaw on Tuesday, Nov. 19, 2013. (AP Photo/Alik Keplicz)
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U.N. Secretary-General Ban Ki-moon addresses delegates at the opening of the High-level Segment of the U.N. Climate Conference in Warsaw on Tuesday, Nov. 19, 2013. (AP Photo/Alik Keplicz)
