Environmental threats to the Great Barrier Reef

The Great Barrier Reef is the world's largest coral reef system,^[2] composed of roughly 3,000 individual reefs and 900 islands that stretch for 2,600 kilometres (1,616 mi) and cover an area of approximately 344,400 km².^[3][4] The reef is located in the Coral Sea, off the coast of Queensland in northeast Australia. A large part of the reef is protected by the Great Barrier Reef Marine Park.

• http://en.wikipedia.org/wiki/Environmental threats to the Great Barrier Reef