Actor Leonardo DiCaprio (C) walks down 6th Avenue during the  the People's Climate March on September 21, 2014. Activists mobilized in cities across the globe Sunday for marches against climate change, with one of the biggest planned for New York, where celebrities, political leaders and tens of thousands of people were expected. The march comes before the United Nations Secretary-General Ban Ki-moon convenes a climate change summit of 120 world leaders .   AFP PHOTO/Timothy A. ClaryTIMOTHY A. CLARY/AFP/Getty Images
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