NOAA says September's Arctic sea ice coverage was about 25 percent less than it was between 1981 and 2010. As America's only Arctic state, Alaska today faces unique challenges. One of those is the loss of permafrost, frozen earth that serves as the foundation for huge portions of the state. Jeff Glor traveled to Alaska and spoke with Sue Natali of the Woods Hole Research Center and you can hear an extended version of their conversation only on the CBS This Morning podcast.