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People gather near Columbus Circle before the People's Climate March in New York on Sunday, September 21. People from around the world are participating in what's billed as the largest march ever calling for action on global warming. Craig Ruttle/AP
A man waves a rainbow flag as he marches in New York. Andrew Burton/Getty Images
Marchers wave signs and banners as they fill a street in London. ADRIAN DENNIS/AFP/Getty Images
Thousands of people joined the march from the Embankment via Whitehall to the Houses of Parliament in central London. Fiona Hanson/AP Images for AVAAZ
Marchers crowd a street in Brussels, Belgium. NICOLAS MAETERLINCK/AFP/Getty Images
Demonstrators gather in Place de la République in Paris. FRANCOIS GUILLOT/AFP/Getty Images
Indian schoolchildren take part in a march in New Delhi. SAJJAD HUSSAIN/AFP/Getty Images
