Click on the scientist's name to go to the extended interview transcript:

Billy Causey: The superintendent of the Florida Keys National Marine Sanctuary traces the causes of reef decline for Betty Ann Bowser of the NewsHour's Science Unit.

Terry Done: An Australian Institute of Marine Science biologist describes the impacts rising ocean temperatures can have on coral reefs.

Sylvia Earle: The executive director for the Global Marine Program for Conservation International and explorer in residence at The National Geographic Society explains why coral reefs are in trouble and why people should care.

Paul Marshall: The Climate Change Program manager of Australia's Great Barrier Reef sheds light on the problem of coral bleaching and updates the progress of conservation efforts in Australia.

Steven Miller: The director of the National Undersea Research Center at the University of North Carolina at Wilmington describes his job, reef conservation efforts and public's perception of the underwater ecosystems.

John Ogden: The director of the Florida Institute of Oceanography discusses what scientists can learn about coral reefs using the Aquarius Undersea Laboratory and how zoning can help reefs survive.