Actor Leonardo DiCaprio takes part in a march against climate change in New York, September 21, 2014. An international day of action on climate change brought hundreds of thousands of people onto the streets of New York City on Sunday, easily exceeding organizers' hopes for the largest protest on the issue in history. Organizers estimated that some 310,000 people, including United Nations Secretary-General Ban Ki-moon, former US Vice President Al Gore, DiCaprio and elected officials from the United States and abroad joined the People's Climate March, ahead of Tuesday's United Nations hosted summit in the city to discuss reducing carbon emissions that threaten the environment. [Photo/Agencies]