Extinction

Coral reefs and many of the oceans' marvels may disappear before this century ends, according to a new scientific study. Science writer Elizabeth Kolbert says we're facing the sixth great extinction. She tells stories from the front lines of the fight against extinction, from Panama to Australia's Great Barrier Reef.

Doug Peacock is a legend in wilderness circles. A friend of Edward Abbey, Peacock was a Vietnam vet so traumatized by the war that he escaped into the wilderness once he returned to America. He says grizzlies saved his life.

Hisham Aidi—an expert on globalization and social movements—discusses the role of hip hop in the French-Muslim community and the recent debates about the genre.