http://green.blogs.nytimes.com/2012/10/01/worrisome-measure-of-decline-at-great-barrier-reef/
The Great Barrier Reef, off the coast of Australia, is rapidly declining. The reef is often cited as an area of conservational success, but has been going downhill since 1985. The three main causes for coral destruction in the reef are cyclones, coral bleaching, and a massive increase in the population of Crown of Thorns Starfish.
Scientists agree that stopping the starfish would be the most effective approach to conserving the reef. The starfish are believed to prosper when exposed to chemical fertilizers from run-off sediment, but no one knows for sure what has caused their recent population boom. Fertilizers may also limit the growth of the coral on its own.
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