Politico: Al Gore, Leonardo DiCaprio and U.N. Secretary General Ban Ki-moon joined a larger-than-expected throng of activists, scientists, students and elected officials who took to New York City's streets Sunday for a massive march meant to sound the alarm about climate change.
Organizers initially estimated that the march had drawn 310,000 people, then raised that estimate to nearly 400,000 -- far exceeding their projections of 100,000 attendees and making the procession through midtown Manhattan by far...