21 Sep 2014, New York City, New York State, USA — New York, United States. 21st September 2014 — An estimated 310,000 people marched through downtown New York City ahead of the United Nations Climate Summit to demand concrete action on climate change in what has been called the “largest climate change march in history”. — An estimated 310,000 people marched through downtown New York City ahead of the United Nations Climate Summit to demand concrete action on climate change. Similar such events were held in many major cities across the globe. — Image by © Paul Weiskel/Demotix/Corbis