Extreme weather is new normal, U.N.'s Ban tells climate talks

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U.N. Secretary General Ban Ki-Moon talks during the opening ceremony of the plenary session of the high-level segment of the 18th session of the Conference of Parties (COP18) of the United Nations Framework Convention on Climate Change (UNFCCC) in Doha December 4, 2012. REUTERS/Fadi Al-Assaad