Lyle Vail, director of the Lizard Island Research Station, examines coral bleaching at Lizard Island, Queensland, Australia. The worst coral bleaching in more than 15 years has hit Lizard Island off far north Queensland, scientists say, prompting fears about other northern parts of the Great Barrier Reef. Lyle Vail said the majority of the reef flat surrounding the island was showing signs of bleaching. (Photo/ WWF Australia)
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