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Coral bleaching

Coral bleaching occurs when coral polyps expel algae that live inside their tissues. Normally, coral polyps live in an endosymbiotic relationship with this algae crucial for the health of the coral and the reef.[1] The algae provides up to 90 percent of the coral's energy. Bleached corals continue to live but begin to starve after bleaching.[2] Some corals recover. ''' Today Rising water temperatures during the seasonal shifts have been the main cause for coral bleaching. . Coral Reefs supplies one quarter of all marine life with food and shelter. '''

Above-average sea water temperatures caused by global warming is the leading cause of coral bleaching.[2] According to the United Nations Environment Programme, between 2014 and 2016 the longest recorded global bleaching events killed coral on an unprecedented scale. '''The Indian Ocean's coral reef in 1998 reported 20 percent of its coral had died and 80 percent were bleached in one year. ''' In 2016, bleaching of coral on the Great Barrier Reef killed between 29 and 50 percent of the reef's coral.[3][4][5] In 2017, the bleaching extended into the central region of the reef.[6][7]The average interval between bleaching events has halved between 1980 and 2016.[8]

-Coral Reefs supply one quarter of all marine life with food and shelter.

-Today rising water temperatures during the seasonal shifts has been the main cause for coral bleaching.

- The Indian Ocean's coral reef in 1998 reported 20 percent of its coral had died and 80 percent were bleached in one year.

Hawaii[edit]
'''In 1996, Hawaii's first major Coral bleaching occurred in Kaneohe Bay, followed by major coral bleaching events in the Northwest Islands in 2002 and 2004. '''

Major bleaching occurred in Hawaiian coral reefs in 1996 and in 2002 .[55] In 2014, biologists from the University of Queensland observed the first mass bleaching event, and attributed it to The Blob.[56] In 2014 and 2015, a survey in Hanauma Bay Nature Preserve on Oahu found 47% of the corals suffering from coral bleaching and close to 10% of the corals dying.[57] In 2014 and 2015, 56% of the coral reefs of the big island were affected by coral bleaching events. During the same period, 44% of the corals on west Maui were effected.[58] Rising water temperatures the past several decades is  believed to put Hawaii's coral reefs in danger. On January 24, 2019, scientists with The Nature Conservancy found that the reefs had begun to stabilize nearly 4 years after the last bleaching event.[59]

- In 1996, Hawaii's first major Coral bleaching occurred in Kaneohe Bay, followed by major coral bleaching events in the Northwest Islands in 2002 and 2004.

- Rising water temperatures the past several decades is believed to put Hawaii's coral reefs in danger.