In Miami Beach, they call it “sunny-day flooding.” You’ll be hanging out downtown under clear blue skies—only to see, whoa, the streets slowly filling with water. Miami Beach, Florida, is a coastal city built on porous limestone, so as climate change melts polar ice into the oceans, water is literally pushed up out of the ground. “It’s an eerie, scary, unnerving feeling, like something out of a sci-fi movie,” says Philip Levine, mayor of the city of 90,000.