Stephen 'Dr. Beach' Leatherman picks America's best beaches and worries about their future

Summary: On the latest SouthBound podcast, host Tommy Tomlinson talks to Stephen Leatherman, who is known as “Dr. Beach” for his annual ranking of the best beaches in America. But he’s also a scientist who has a lot to say about how to protect our beaches—both on a global scale and through little things any beachgoer can do.