Hour 2: What will it take to preserve the remaining few pristine marine ecosystems on the planet? We’ll talk this hour with Gregory Stone, Ph.D., executive vice president and chief ocean scientist of Conservation International and senior vice president of exploration and conservation at the New England Aquarium. His new book, co-written with David Obura, is “Underwater Eden: Saving the Last Coral Wilderness on Earth” (University Of Chicago Press, 2012).