Great white sharks are disappearing from California waters and should be protected under the U.S. Endangered Species Act, according to a petition filed by environmental groups this week. We discuss the proposal and find out what is threatening the sharks.
David McGuire, marine biologist and founder of the nonprofit Sea Stewards, one of the environmental groups which filed the petition
John McCosker, senior scientist and chair of the department of aquatic biology at the California Academy of Sciences