The Great Barrier Reef is the worlds largest coral reef and is in great danger. Over the past 3 decades, the Great Barrier Reef has lost over half its coral and it is estimated that by 2050 the Great Barrier Reef will disappear. This is caused by climate change, pollution, coral bleaching, remaining impacts from fishing and coal. people need to stop the use of plastic, chemicals and reduce climate change before we can see a difference.