Demonstrators make their way down Sixth Avenue in New York during the People's Climate March Sunday, September 21, 2014. The march, along with similar gatherings scheduled in other cities worldwide, comes two days before the United Nations Climate Summit, where more than 120 world leaders will convene for a meeting aimed at galvanizing political will for a new global climate treaty by the end of 2015. (Photo by Jason DeCrow/AP Photo)
