Australia's Great Barrier Reef is the largest natural structure on earth, but like so many of the earth's treasures these days, it is under threat from global warming.

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This episode of Al Jazeera English - Witness travels to Australia’s Great Barrier Reef, the largest natural structure on earth. Like so many of the earth’s treasures these days, the reef faces a grave threat. Polyps, the tiny organisms that manufacture the coral, are threatened with extinction because of rising water temperatures, caused by global warming. This film documents the damage already caused, examines possible remedies and questions whether man still has time to save the reef.

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About Al Jazeera - Witness

Rageh Omaar presents Witness, a half-hour daily documentary series which features short, specially commissioned or acquired films gathered from independent filmmakers.
 
Each documentary reveals the unknown lives of ordinary people, following their lives, telling their stories and portraying the challenges that confront them. Our witnesses are people in a situation or those who have observed them first hand.
 
The films cover conflict, belief, the past and the future and as well as bringing new stories to light they showcase the talents of a new breed of multi-skilled, frontline journalist. In the studio, Rageh will further explore the issues raised in the films, with expert guests on the subject matter and the filmmakers themselves.