The 400,000 protesters who participated in the People's Climate March on September 21st included some famous faces. We caught up with director Darren Aronofsky, actor Paul Bettany and more – and captured some of the most striking moments of the protest – as they marched through the streets of New York to demand a better tomorrow. "People don't march as much anymore, because they're uniting on the Internet," Aronofsky tells Rolling Stone. "It's great to get people out into the streets."