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    Warm seas threaten Great Barrier Reef

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Warm seas threaten Great Barrier Reef

Bleaching has killed off 35% of coral in central and northern parts of Australia's Great Barrier Reef, extensive aerial and underwater surveys have revealed.

Warm seas threaten Great Barrier Reef

Bleaching has killed off 35% of coral in central and northern parts of Australia's Great Barrier Reef, extensive aerial and underwater surveys have revealed.