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FILE - In this Saturday, Nov. 11, 2017 file photo, Patricia Espinosa, executive secretary of the United Nations Framework Convention on Climate Change, smiles in the U.S. Climate Action Center during the "AMERICA'S PLEDGE" and "WE ARE STILL IN" campaign at the COP 23 Fiji UN Climate Change Conference in Bonn, Germany. The U.N.’s climate chief Patricia Espinosa says deadlines set by some of the world's top polluters to end greenhouse gas emissions, along with president-elect Joe Biden's pledge to take the United States back into the Paris accord, have boosted hopes of meeting the pact's ambitious goals. (AP Photo/Martin Meissner, File)

FILE - In this Saturday, Nov. 11, 2017 file photo, Patricia Espinosa, executive secretary of the United Nations Framework Convention on Climate Change, smiles in the U.S. Climate Action Center during the "AMERICA'S PLEDGE" and "WE ARE STILL IN" campaign at the COP 23 Fiji UN Climate Change Conference in Bonn, Germany. The U.N.’s climate chief Patricia Espinosa says deadlines set by some of the world's top polluters to end greenhouse gas emissions, along with president-elect Joe Biden's pledge to take the United States back into the Paris accord, have boosted hopes of meeting the pact's ambitious goals. (AP Photo/Martin Meissner, File)

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