American cities along the coasts have grown larger and larger despite being prone to floods and other natural disasters. But POLITICO’s Zack Colman and Katy O’Donnell report this growth has largely ignored climate threats, and this could crush the mortgage market. Kelsey Tamborrino is a Politico Energy reporter.Irene Noguchi is the executive producer of Politico's audio department.Jenny Ament is the senior producer of Politico's audio department.Carlos Prieto is a Politico podcast producer. Learn more about your ad choices. Visit megaphone.fm/adchoices