Mid-frequency sonar used by the Navy has been linked to mass beachings of marine mammals, including whales and dolphins. This year, a federal court ruled that environmental precautions must be taken before using the sonar in California. The Navy says that protecting marine animals is coming at the expense of national security and appealed the ruling. The U.S. Supreme Court will soon take up the issue. Host Bruce Gellerman talks with Joel Reynolds, senior attorney and director of the Marine Mammal Protection Project at the Natural Resources Defense Council, about the issue.