Broadway's "Girl from the North Country" is a powerful touchdown in Depression-era Duluth, Minnesota. The show showcases music in a way rarely seen on Broadway. We speak with some of the actors. And, more than 4 million square miles of carbon-rich soil in the Arctic has been frozen for hundreds, maybe thousands, of years. But in some places, it's beginning to thaw. Reporter Daniel Grossman talks with two scientists who say if that trend continues, the outcome could be catastrophic.