Mon, Jun 29, 2009 -- 8:33 AM

Putting a Price on Nature
As the economy struggles, a lot of people are thinking about prices these days. That's the focus of a new project at Stanford University, too, but its aim is to put a value on something that's never had a price tag -- nature.

Get the Flash Player to see this player.

Download audio (MP3)

Host: Andrea Kissack

Reporters: