Since like 1980's the Great Barrier Reef has lost about half of its coral. Its all because of this one kind of start fish its kind eats about 10 square meter in a year, that's a lot. They say that the ecosystem has experienced a lot of damage. The damage was caused by tropical cyclones, starfish (crown of thorns), and coral bleaching. If this keeps up in 10 years another half of it will be gone. The only thing they can really do to help fix this is to get rid of the starfish because they cant control the storms or coral bleaching cause they are natural occurring things its nature.
http://news.blogs.cnn.com/2012/10/02/scientists-to-save-great-barrier-reef-kill-starfish/?hpt=hp_c2
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