Global warming is increasing the intensity and number of forest fires across the American West. Scott Pelley goes to the fire line to report. Plus, plumpynut is a cheap, nutritious food that needs no refrigeration or preparation that is saving starving children in the developing world. CNN's Anderson Cooper reports on this miracle product that would save even more lives if more of it could be made. And, Valerie Plame Wilson, the former covert CIA officer whose leaked identity resulted in a national scandal that reached all the way to the White House, appears in her first interview.