Charles C. Mann and James Fallows are featured in this discussion. Speakers: Charles C. Mann, James Fallows

In Conversation with EPA Administrator Gina McCarthy and Hari Sreenivasan. Speakers: Gina McCarthy, Hari Sreenivasan

Award-winning photographer and filmmaker Pete McBride will present his ongoing work on watersheds, rivers and freshwater around the world. Called a Freshwater Hero by "National Geographic", McBride will show short films and imagery from the Ganges River (sacred) and the Colorado (scarce) — both...