Great Barrier Reef
The Great Barrier Reef is the world's largest coral reef system. The reef is located in the Coral Sea and a large part of the reef is protected by the Great Barrier Reef Marine Park. Particular environmental pressures include surface runoff, salinity fluctuations, climate change, cyclic crown-of-thorns outbreaks, overfishing, and spills or improper ballast discharge. According to the 2014 report of the Government of Australia's Great Barrier Reef Marine Park Authority (GBRMPA), climate change is the most significant environmental threat to the Great Barrier Reef. , 50% of the coral on the Great Barrier Reef has been lost.