We're back with our second of two episodes on scarcity. This time, we're joined by award-winning journalist (and former rafting guide) Heather Hansman. She's the author of "Downriver: Into the Future of Water in the West," a book chronicling her trip down the Green River. The Green is the Colorado River's largest tributary. And, as Heather learned, an excellent window into understanding the cultural and environmental landscapes of water in the Western United States: "I got my assumptions busted pretty quickly on the trip about what was good and what was bad and what was fair."