In what's being called the biggest and most diverse climate march ever, more than 400,000 people jammed the streets of New York City yesterday in a massive show of strength ahead of tomorrow's United Nations climate summit. U.N. Secretary General Ban Ki-Moon marched. So did Leonardo DiCaprio, Mark Ruffalo and former Vice President Al Gore. Joining them were students, veterans, nuns, First Nation members, unions and farmers. Their presence confirmed that the climate battle is no longer the burden only of environmentalists and older activists familiar with the barricades, but of everyone. The devastating effects of climate change are being felt around the world. Faced with stalled climate negotiations (and, in D.C., a House of Representatives called the most anti-environmental in history) the real fight for the planet is beginning. "This is the most important day yet in the fight against global warming – but it is still just one day in the life of a movement," Bill McKibben tells Rolling Stone. "We will need to keep growing this fight bigger and stronger, and we will need to do it fast, since that's the speed at which the pace of climatic destruction is accelerating." Here are some of the thousands who took to the streets of Manhattan to demand action, to say no more business as usual.