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Open Image ModalPolicemen fight with activists during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Laurent Cipriani/AP)
(02 of12)
Open Image ModalAn activist is arrested by riot police officers during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Thibault Camus/AP)
(03 of12)
Open Image ModalActivists fight with policemen during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Christophe Ena/AP)
(04 of12)
Open Image ModalProtesters hold Greenpeace banners as they move through the streets of central Madrid during the Global Climate March, Sunday Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Ochoa de Olza/AP)
(05 of12)
Open Image ModalHundreds of pairs of shoes are displayed at the place de la Republique, in Paris, as part of a symbolic and peaceful rally called by the NGO Avaaz "Paris sets off for climate", Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Laurent Cipriani/AP)
(06 of12)
Open Image ModalA protester holds a green heart placard as others march with banners reading '100% renewable' and 'the rich contaminate and the south exterminate' as they move through the streets of central Madrid during the Global Climate March, Sunday Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Ochoa de Olza/AP)
(07 of12)
Open Image ModalProtesters display placards during a rally at the Presidential Palace in Manila, Philippines to coincide with the COP21, United Nations Climate Change Conference in Le Bourget, outside Paris, Monday, Nov. 30, 2015. The protesters are pressing world leaders of industrialized nations and global corporations for "climate justice" for their alleged unabated abuse of the environment. (credit:Bullit Marquez/AP)
(08 of12)
Open Image ModalActivists run as they clash with policemen during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Christophe Ena/AP)
(09 of12)
Open Image ModalAn activist takes a selfie during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Christophe Ena/AP)
(10 of12)
Open Image ModalPolicemen fight with activists on the candles and flowers set in memory of the victims of the Paris attacks during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Laurent Cipriani/AP)
(11 of12)
Open Image ModalPolicemen fight with activists during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, Nov. 29, 2015. More than 140 world leaders are gathering around Paris for high-stakes climate talks that start Monday, and activists are holding marches and protests around the world to urge them to reach a strong agreement to slow global warming. (credit:Laurent Cipriani/AP)
(12 of12)
Open Image ModalA general view of the atmosphere at The People's March for Climate, Justice and Jobs ahead of COP21 on November 29, 2015 in London, England. (credit:David M. Benett/Dave Benett/Getty Images)