Policemen run toward activists during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 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. (Photo by Christophe Ena/AP Photo)





Activists fight with policemen during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 29, 2015. (Photo by Christophe Ena/AP Photo)





An activist takes a selfie during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 29, 2015. (Photo by Christophe Ena/AP Photo)





An 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, November 29, 2015. (Photo by Thibault Camus/AP Photo)





A demonstrator in a mask walks past smoke as demonstators clash with French riot police during on Place de la Republique ahead of the COP21 World Climate Change Conference 2015 in Paris, France, Sunday, November 29, 2015. (Photo by Ian Langsdon/EPA)





Activists form a human chain during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 29, 2015. (Photo by Christophe Ena/AP Photo)





Activists run as they clash with policemen during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 29, 2015. (Photo by Christophe Ena/AP Photo)





A man is detained by policemen 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, November 29, 2015. (Photo by Laurent Cipriani/AP Photo)





A message saying 'Walk for the earth' is seen on a pair of shoes, as hundreds 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, November 29, 2015. (Photo by Laurent Cipriani/AP Photo)





Policemen fight with activists during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, November 29, 2015. (Photo by Laurent Cipriani/AP Photo)





A Woman is arrested by riot police after clashes as they participate in a demonstration at Republique Square on the eve of the COP21 Conference opening, Paris, France, Sunday, November 29, 2015. The 21st Conference of the Parties (COP21) due to be held in Paris from 30 November to 11 December will proceed as planned, despite the terrorist attacks of 13 November. US President Barack Obama, German Chancellor Angela Merkel as well as leaders from India, South Africa and China are among the leaders planning to come. The aim is to reach an international agreement to limit greenhouse gas emissions and curtail climate change. (Photo by Guillaume Horcajuelo/EPA)





Policemen fight with activists during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, November 29, 2015. (Photo by Laurent Cipriani/AP Photo)





Policemen detain an activist during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 29, 2015. (Photo by Christophe Ena/AP Photo)





A demonstrator is arrested by the riot police during the forbidden COP21 demonstration on November 29, 2015 in Paris, France. The demonstration was banned after the Paris terror attacks on Friday, November 13th. Nevertheless, thousands of people gathered to protest against global warming ahead of COP21 and an estimated 100 people were arrested after fighting with police. (Photo by Aurelien Meunier/Getty Images)





A demonstrator with an anonymous mask is seen during the forbidden COP21 demonstration on November 29, 2015 in Paris, France. (Photo by Aurelien Meunier/Getty Images)





A cyclist wears a helmet with a solar panel attached as he participates in a march the day before the Paris World Climate Change Conference, along the main street of Adelaide, South Australia November 29, 2015. (Photo by David Gray/Reuters)





Filipino environmental activists perform during a "Climate Solidarity Prayer" march ahead of the 2015 Paris Climate Change Conference, known as the COP21 summit, in Manila November 29, 2015. (Photo by Czar Dancel/Reuters)





Mounted police form a cordon as protesters march during a rally held ahead of the 2015 Paris Climate Change Conference, known as the COP21 summit, in Sydney's central business district, Australia November 29, 2015. (Photo by Jason Reed/Reuters)





Protesters hold placards during a rally held ahead of the 2015 Paris Climate Change Conference, known as the COP21 summit, in Sydney's central business district, Australia November 29, 2015. (Photo by Jason Reed/Reuters)





Giant puppets representing Australian Prime Minister Malcolm Turnbull (L) and his predecessor Tony Abbott parade in front of the Sydney Opera House during a rally held ahead of the 2015 Paris Climate Change Conference, known as the COP21 summit, in Sydney's central business district, Australia November 29, 2015. (Photo by Jason Reed/Reuters)





Nuns holding balloons prepare to march during a rally ahead of the 2015 Paris Climate Change Conference, known as the COP21, in central Seoul, South Korea, November 29, 2015. (Photo by Kim Hong-Ji/Reuters)





A pair of beach sandals with green moss (R) and French espadrilles with pine cones and snails are symbolically placed on the Place de la Republique, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Protesters carry styrofoam cut-outs depicting polar bears during a march ahead of the 2015 Paris Climate Change Conference, known as the COP21 summit, in Hong Kong November 29, 2015. (Photo by Tyrone Siu/Reuters)





Environmental activists stand among pairs of shoes symbolically placed on the Place de la Republique, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Protesters raise their placards as a Greek national flag flutters atop the parliament building during a rally held ahead of the 2015 Paris Climate Change Conference, known as the COP21 summit, in Athens, Greece, November 29, 2015. (Photo by Alkis Konstantinidis/Reuters)





A woman with a polar bear hat participates in a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





People form a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





A man holds a placard which reads "Peace" in front of CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Demonstrators clash with CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





People form a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. The slogan reads "Climatic emergency state, for a climate of peace". (Photo by Benoit Tessier/Reuters)





Demonstrators clash with CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Demonstrators face CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Demonstrators clash with CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





A protester dressed as a panda bear demonstrates during a rally held the day before the start of the Paris Climate Change Summit in Madrid, Spain, November 29, 2015. The placard reads: "Stop Climate Change". (Photo by Andrea Comas/Reuters)





People form a human chain to show solidarity for climate change after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. The slogan reads " For a Climate of Peace". (Photo by Benoit Tessier/Reuters)





French CRS riot police apprehend a demonstrator during clashes near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Protesters demonstrate during a rally held the day before the start of the Paris Climate Change Summit, in London, Britain November 29, 2015. (Photo by Suzanne Plunkett/Reuters)





Environmental activists hold red umbrellas as they take part in a symbolic human chain gathering, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Marseille, France, November 29, 2015. (Photo by Jean-Paul Pelissier/Reuters)





Demonstrators clash with CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Street artists holds a leaflet for the climate as environmental activists take part in a symbolic human chain gathering, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Marseille, France, November 29, 2015. (Photo by Jean-Paul Pelissier/Reuters)





French CRS riot police take cover behind shields during clashes with demonstratores near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Pairs of shoes are symbolically placed on the Place de la Republique, after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





An environmentalist attends a demonstration near French CRS police before clashes at the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





A demonstrator throws a projectile at French CRS riot police during clashes at the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





Environmentalists gather during a protest near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





A protester wears a polar bear outfit during a rally held the day before the start of the Paris Climate Change Summit, in London, Britain November 29, 2015. (Photo by Suzanne Plunkett/Reuters)





Protesters carry a globe-shaped balloon in front of Rome's Colosseum during a rally held the day before the start of the 2015 Paris Climate Change Conference (COP21), in Rome, Italy, November 29 2015. (Photo by Alessandro Bianchi/Reuters)





Protesters depicting mud perform during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Rio de Janeiro, Brazil, November 29, 2015. (Photo by Pilar Olivares/Reuters)





A girl attends a rally held the day before the start of the Paris Climate Change Conference (COP21), in Santiago, Chile November 29, 2015. In the tatoo reads, "To much little people, at the little places, doing little things, can change the world. Galeano". (Photo by Pablo Sanhueza/Reuters)





A Colombian Barzano man and a woman take part in a symbolic ritual before a march ahead of the 2015 Paris Climate Change Conference (COP21), in Bogota, Colombia November 29, 2015. (Photo by Jose Miguel Gomez/Reuters)





Demonstrators take part in a rally held the day before the start of the Paris Climate Change Conference (COP21), in Valparaiso city, Chile November 29, 2015. The banner reads, "The care of the Glaciers is care for the life". (Photo by Rodrigo Garrido/Reuters)





Demonstrators clash with CRS riot policemen near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





A man with a bicycle walks past CRS riot policemen after clashes with demonstrators at the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Eric Gaillard/Reuters)





Environmentalists gather during a protest near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





Environmentalists dance during a protest near the Place de la Republique after the cancellation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris, France, November 29, 2015. (Photo by Benoit Tessier/Reuters)





A Greenpeace activist dressed as a bear holds up a banner during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. The banner reads, "Climate Change". (Photo by Daniel Becerril/Reuters)





Indigenous children depict fish in the sea during a rally held the day before the start of the Paris Climate Change Conference (COP21), in Sao Paulo, Brazil, November 29, 2015. (Photo by Nacho Doce/Reuters)





A protester takes part in a rally held the day before the start of the 2015 Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. (Photo by Daniel Becerril/Reuters)





An activist wearing a Guy Fawkes mask participates in a rally held a day before the start of the Paris Climate Change Conference (COP21), in La Paz, Bolivia, November 29, 2015. (Photo by David Mercado/Reuters)





A man rides his bicycle while carrying an Alebrije as he takes part in a rally held the day before the start of the 2015 Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. (Photo by Daniel Becerril/Reuters)





Protesters take part in a rally held the day before the start of the 2015 Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. (Photo by Daniel Becerril/Reuters)





Protesters place a banner on a fence in the perimeter of the Senate building as they take part in a rally held the day before the start of the 2015 Paris Climate Change Conference (COP21), in Mexico City, Mexico November 29, 2015. The banner reads, "Global climate march-Mexico 2015". (Photo by Daniel Becerril/Reuters)





Activists wearing gas mask replicas hold placards during in a rally held the day before the start of the Paris Climate Change Conference (COP21), in La Paz, Bolivia, November 29, 2015. The placard reads, "If you want to keep living, your surroundings have to continue to exist". (Photo by David Mercado/Reuters)





People take part in a protest about climate change around New York City Hall at lower Manhattan, New York, November 29, 2015, a day before the start of the Paris Climate Change Conference (COP21). (Photo by Eduardo Munoz/Reuters)





Protesters dressed as Santa Claus take part in a protest about climate change at New York City Hall steps in lower Manhattan, New York, November 29, 2015, a day before the start of the Paris Climate Change Conference (COP21). (Photo by Eduardo Munoz/Reuters)





Activists clash with policemen during a protest ahead of the 2015 Paris Climate Conference, in Paris, Sunday, November 29, 2015. (Photo by Christophe Ena/AP Photo)





Policemen fight with activists during a protest ahead of the 2015 Paris Climate Conference at the place de la Republique, in Paris, Sunday, November 29, 2015. (Photo by Laurent Cipriani/AP Photo)





Hundreds 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, November 29, 2015. (Photo by Laurent Cipriani/AP Photo)





Protestors dressed as angels hold signs as they participate in the human chain demonstration at Republique Square on the eve of the COP21 Conference opening, Paris, France, Sunday, November 29, 2015. (Photo by Ian Langsdon/EPA)