Noah Adams talks with Gretel Ehrlich, author of This Cold Heaven, about the seven seasons she spent in Greenland. Ehrlich is enchanted by the darkness, the stillness of this northern island. The book documents her obsession with the terrain and the people of Greenland. She talks of the long dark nights of the winter and the long hunting expeditions in the icy harsh climate. (7:45) This Cold Heaven is published by Pantheon.