Storms, Starfish Wiped out Half of Great Barrier Reef Coral
Clip: Season 2012 | 5m 51s
A new study finds that in the last 27 years, half of Australia's Great Barrier Reef coral has died. Gwen Ifill talks to 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.
Aired: 10/02/12
