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A picture taken on November 6, 2017 shows a installation made out of placards reading slogans at the Rheinaue park during the COP23 United Nations Climate Change Conference in Bonn, Germany. / AFP PHOTO / PATRIK STOLLARZ (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

A picture taken on November 6, 2017 shows a installation made out of placards reading slogans at the Rheinaue park during the COP23 United Nations Climate Change Conference in Bonn, Germany. / AFP PHOTO / PATRIK STOLLARZ        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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The bronze sculpture "Unbearable" by the Danish artist Jens Galschiot featuring an polar bear impaled on an oil pipeline is on display at Rheinaue park during the COP23 United Nations Climate Change Conference in Bonn, Germany. / AFP PHOTO / PATRIK STOLLARZ / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

The bronze sculpture "Unbearable" by the Danish artist Jens Galschiot featuring an polar bear impaled on an oil pipeline is on display at Rheinaue park during the COP23 United Nations Climate Change Conference in Bonn, Germany.
 / AFP PHOTO / PATRIK STOLLARZ / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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A sculpture featuring climate refugees created by Danish artist Jens Galschiot is seen at Rheinaue park during the COP23 United Nations Climate Change Conference in Bonn, Germany. / AFP PHOTO / PATRIK STOLLARZ / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

A sculpture featuring climate refugees created by Danish artist Jens Galschiot is seen at Rheinaue park during the COP23 United Nations Climate Change Conference in Bonn, Germany.
 / AFP PHOTO / PATRIK STOLLARZ / RESTRICTED TO EDITORIAL USE - MANDATORY MENTION OF THE ARTIST UPON PUBLICATION - TO ILLUSTRATE THE EVENT AS SPECIFIED IN THE CAPTION        (Photo credit should read PATRIK STOLLARZ/AFP/Getty Images)

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BONN, GERMANY - NOVEMBER 11: Visitors enter the U.S. "We Are Still In" pavilion at the COP 23 United Nations Climate Change Conference on November 11, 2017 in Bonn, Germany. A delegation of U.S. business, state and city government presented United Nations Framework Convention on Climate Change (UNFCCC) Executive Secretary Patricia Espinosa with the America's Pledge report detailing the efforts of U.S. states, cities and businesses to keep America on line in fulfilling goals towards carbon reduction set out by the Paris Climate Agreement. The "We Are Still In" initiative is an alliance of U.S. state and city government representatives, business interests and climate activists who want the U.S. To remain a signatory of the Paris Climate Agreement. U.S. President Donald Trump has announced that the U.S. is withdrawing from the Paris Agreement and the White House is sending its own delegation of fossil fuel supporters to the COP 23 conference next week to make the case for the continued role of coal and petroleum in world energy needs. (Photo by Lukas Schulze/Getty Images)

BONN, GERMANY - NOVEMBER 11: Visitors enter the U.S. "We Are Still In" pavilion at the COP 23 United Nations Climate Change Conference on November 11, 2017 in Bonn, Germany. A delegation of U.S. business, state and city government presented United Nations Framework Convention on Climate Change (UNFCCC) Executive Secretary Patricia Espinosa with the America's Pledge report detailing the efforts of U.S. states, cities and businesses to keep America on line in fulfilling goals towards carbon reduction set out by the Paris Climate Agreement. The "We Are Still In" initiative is an alliance of U.S. state and city government representatives, business interests and climate activists who want the U.S. To remain a signatory of the Paris Climate Agreement. U.S. President Donald Trump has announced that the U.S. is withdrawing from the Paris Agreement and the White House is sending its own delegation of fossil fuel supporters to the COP 23 conference next week to make the case for the continued role of coal and petroleum in world energy needs. (Photo by Lukas Schulze/Getty Images)

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BONN, GERMANY - NOVEMBER 11: Climate activists join a discussion at the America's Pledge launch event at the U.S. "We Are Still In" pavilion at the COP 23 United Nations Climate Change Conference on November 11, 2017 in Bonn, Germany. America's Pledge is a report detailing the efforts of U.S. states, cities and businesses to keep America on line in fulfilling goals towards carbon reduction set out by the Paris Climate Agreement. U.S. President Donald Trump has announced that the U.S. is withdrawing from the accord and the White House is sending its own delegation of fossil fuel supporters to the COP 23 conference next week to make the case for the continued role of coal and petroleum in world energy needs. (Photo by Lukas Schulze/Getty Images)

BONN, GERMANY - NOVEMBER 11: Climate activists join a discussion at the America's Pledge launch event at the U.S. "We Are Still In" pavilion at the COP 23 United Nations Climate Change Conference on November 11, 2017 in Bonn, Germany. America's Pledge is a report detailing the efforts of U.S. states, cities and businesses to keep America on line in fulfilling goals towards carbon reduction set out by the Paris Climate Agreement. U.S. President Donald Trump has announced that the U.S. is withdrawing from the accord and the White House is sending its own delegation of fossil fuel supporters to the COP 23 conference next week to make the case for the continued role of coal and petroleum in world energy needs. (Photo by Lukas Schulze/Getty Images)