The People's Climate March ambled genially down 6th Avenue in New York City Sunday afternoon. The March's slogan was "To Change Everything, We Need Everyone." Not everyone showed up, but the March did attract between 300,000 and 400,000 participants, making it by far the largest climate change mobilization in history. Reason Science Correspondent Ronald Bailey wandered among the throngs prior to the March's kick off where it was apparent that every progressive cause can and does find a home in the climate change movement. The chief demand of the marchers is for "climate justice," which broadly entails redistributing wealth from the countries and industries that have benefited from the consumption of fossil fuels.