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Hundreds of thousands of people from Australia to Paraguay joined the biggest day of climate change activism in history on Sunday, telling world leaders gathering for a summit in Paris there is 'No Planet B' in the fight against global warming.

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Protesters carry a globe-shaped balloon in front of Rome's Colosseum in Rome, Italy.Alessandro Bianchi/Reuters

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Protesters participate in the Global Climate March in downtown Vancouver.Ben Nelms/The Globe and Mail

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Activists of the World Wildlife Fund (WWF) wearing endangered species costumes perform at the Revolution monument in Mexico City.Yuri Cortez/AFP / Getty Images

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People perform at Ipanema beach in Rio de Janeiro, Brazil.Christophe SIimon/AFP / Getty Images

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Protesters take part in a rally held the day before the start of the 2015 Paris Climate Change Conference, on Parliament Hill in Ottawa.Chris Wattie/Reuters

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A woman takes part in the Global Climate March in Sao Paulo, Brazil.Nelsom Almeida/AFP / Getty Images

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A person dressed up as a panda bear takes part in the "Global Climate March" on November 29, 2015 in Madrid, Spain.Gerard Julien/AFP / Getty Images

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A participant with painted face attends the Global Climate March in Jakarta, Indonesia,.Dita Alangkara/The Associated Press

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A woman stays in front of a model of the earth holding a thermometer as activists participate in the Global Climate March in Berlin, Germany.Carsten Koall/Getty Images

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A Filipino environmental activist looks out from a "sun" cardboard cutout during a global protest action ahead of the 2015 Paris Climate Conference.Erik De Castro/Reuters

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