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One of the biggest natural tragedies of recent years is the deterioration of Australia's Great Barrier Reef , a vast structure of coral off the continent's east coast that supports a profusion of wildlife. In addition to overfishing and nutrient pollution, the world's largest natural structure has suffered from rising ocean temperatures. But, perhaps less well known, Australia's west coast has some massive reefs of its own, offshore in the southeastern Indian Ocean.

One of the biggest natural tragedies of recent years is the deterioration of Australia's Great Barrier Reef , a vast structure of coral off the continent's east coast that supports a profusion of wildlife.