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Pictures | Thu Nov 21, 2013 | 7:40pm GMT

Ban Ki-moon seeks bold climate pledges at 2014 summit; not a deadline

U.N. Secretary General Ban Ki-moon delivers a speech as he attends the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel

U.N. Secretary General Ban Ki-moon delivers a speech as he attends the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel

U.N. Secretary General Ban Ki-moon delivers a speech as he attends the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel
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U.N. Secretary General Ban Ki-moon gestures during an interview during the 19th conference of the United Nations Framework Convention on Climate Change (COP19) in Warsaw November 21, 2013. REUTERS/Kacper Pempel

U.N. Secretary General Ban Ki-moon gestures during an interview during the 19th conference of the United Nations Framework Convention on Climate Change (COP19) in Warsaw November 21, 2013. REUTERS/Kacper Pempel

U.N. Secretary General Ban Ki-moon gestures during an interview during the 19th conference of the United Nations Framework Convention on Climate Change (COP19) in Warsaw November 21, 2013. REUTERS/Kacper Pempel
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(L-R) Christiana Figueres, executive secretary of the U.N. Framework Convention on Climate Change (COP), U.N. Secretary General Ban Ki-moon and Polish Prime Minister Donald Tusk listen to Polish Environment Minister Marcin Korolec during the COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel

(L-R) Christiana Figueres, executive secretary of the U.N. Framework Convention on Climate Change (COP), U.N. Secretary General Ban Ki-moon and Polish Prime Minister Donald Tusk listen to Polish Environment Minister Marcin Korolec during the COP19...more

(L-R) Christiana Figueres, executive secretary of the U.N. Framework Convention on Climate Change (COP), U.N. Secretary General Ban Ki-moon and Polish Prime Minister Donald Tusk listen to Polish Environment Minister Marcin Korolec during the COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel
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U.N. Secretary General Ban Ki-moon (C), Head of the U.N.'s Climate Change Secretariat Christiana Figueres and Polish Prime Minister Donald Tusk arrive for the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel

U.N. Secretary General Ban Ki-moon (C), Head of the U.N.'s Climate Change Secretariat Christiana Figueres and Polish Prime Minister Donald Tusk arrive for the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November...more

U.N. Secretary General Ban Ki-moon (C), Head of the U.N.'s Climate Change Secretariat Christiana Figueres and Polish Prime Minister Donald Tusk arrive for the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel
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U.N. Secretary General Ban Ki-moon (C) sits between Christiana Figueres, head of the U.N.'s Climate Change Secretariat and Polish Prime Minister Donald Tusk as he attends the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel

U.N. Secretary General Ban Ki-moon (C) sits between Christiana Figueres, head of the U.N.'s Climate Change Secretariat and Polish Prime Minister Donald Tusk as he attends the Convention on Climate Change COP19 conference at the National Stadium in...more

U.N. Secretary General Ban Ki-moon (C) sits between Christiana Figueres, head of the U.N.'s Climate Change Secretariat and Polish Prime Minister Donald Tusk as he attends the Convention on Climate Change COP19 conference at the National Stadium in Warsaw November 19, 2013. REUTERS/Kacper Pempel
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