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PBS NewsHour

Storms, Starfish Wiped out Half of Great Barrier Reef Coral

5:51

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.

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PBS NewsHour

State of the Union 2016

PBS NEWSHOUR offers live coverage of President Obama's speech and the Republican response.

0:20

PBS NewsHour

PBS NewsHour Weekend

Premieres Saturday, September 7, 2013 at 6 p.m. ET.

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