Mass coral ＿＿（34）＿＿ , a global problem triggered by global warming, ＿＿（35）＿＿ when coral polyps expel colorful algae, causing the coast barrier and skeletal. The algae provide up 90 percent of the coral’s energy and the effect leaves the coral to ＿＿（36）＿＿ . The Great Barrier Reef illustrates how extensive the damage can be. Thirty percent of the coral perished in 2016 and twenty percent in 2017. The situation is ＿＿（37）＿＿ to a forest after a ＿＿（38）＿＿ fire. Much of the marine ecosystem along the reef’s north coast has with little hope of recovery.