2014 People's Climate March

The People's Climate March (PCM) was a large-scale activist event orchestrated by the People's Climate Movement to advocate global action against climate change, which took place on Sunday, September 21, 2014, in New York City, along with a series of companion actions worldwide, many of which also took the name People's Climate March. With an estimated 311,000 participants, the New York event was the largest climate change march in history.

Source: Wikipedia — 2014 People's Climate March (CC BY-SA 4.0)