This week marks 10 years since the People’s Climate March, then the largest climate march in history. Hundreds of thousands of people, led by Indigenous and environmental justice groups most impacted by climate change, marched in the streets of New York City on the eve of the UN Climate Summit. Joined by labor unions, faith groups, and activists of all ages, the march was a rallying cry to demand serious action in the face of a warming planet and the ultimate existential crisis.