Yesterday, the Sea of People took their climate action rally to Battery Park with hundreds of people present. Participants, dressed in blue shirts, blue scuba gear, even blue whale costumes, demonstrated how lower Manhattan will look when sea levels rise due to global warming, a possibility that's ever more alarming as we contemplate this rainy, stormy Sunday. Videographer Kelly Loudenberg spoke to participants and experienced the sea of people.

And we interviewed Sea of People organizers on Thursday.