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As global leaders gather for UN climate talks, protesters urge action.

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Protestors shout slogans while taking part in the 'Flood Wall Street' demonstration in Lower Manhattan, New York.ADREES LATIF/Reuters

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A man is silhouetted as he climbs a poll to signal to comrades during the 'Flood Wall Street' demonstration in Lower Manhattan, New York.ADREES LATIF/Reuters

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Protestors throw blue powder during the Flood Wall Street march against the human-related causes of climate change in New York.CHRISTIAN HANSEN/The New York Times

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New York City Police officers watch protestors during the "Flood Wall Street" protest in New York City.Bryan Thomas/Getty Images

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Police attempt to secure a barricade from protestors during a march demanding action on climate change.John Minchillo/The Associated Press

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A woman in front of a barricade during the Flood Wall Street protest in New York.CHRISTIAN HANSEN/The New York Times

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Protesters demanding economic and political changes to curb the effects of global warming play music while holding a sit-in near the Wall Street Bull Statue on in New York City.Andrew Burton/Getty Images

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Police arrest a demonstrator dressed in a polar bear costume during the "Flood Wall Street" protest to bring awareness to climate change, in New York.MICHAEL APPLETON/The New York Times

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A police officer watches protestors during the "Flood Wall Street" protest in New York City.Bryan Thomas/Getty Images

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A protestor sits on a pile of barricades during the "Flood Wall Street" protest in New York City.Bryan Thomas/Getty Images

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