A new study finds that over the past 27 years, half of Australia’s Great Barrier Reef coral has died. In a recent PBS NewsHour, Gwen Ifill talks to Dr. Nancy Knowlton, a coral reef biologist and chair of Marine Science at the Smithsonian Institution, about ecological and economical consequences of the collapse, as well as measures to help mediate the decline.
Watch and learn more about the state of Australia’s Great Barrier Reef.…