Scientists have discovered that Australia’s Great Barrier Reef lost more than half of its coral populations between 1995 and 2017.  Researchers at the The Great Barrier Reef stretches across 2,300 kilometers down Australia’s northeastern coast and is home to a wide variety of marine life, making it the world’s largest coral reef ecosystem. The region was named a World Heritage Site by UNESCO (U.N. Educational, Scientific and Cultural Organization) in 1981.