Severe bleaching event is damaging parts of the Great Barrier Reef like never before
[IMG]http://rack.0.mshcdn.com/media/ZgkyMDE2LzAzLzMwL2ViL0NvcmFsQmxlYW**LmQ0MzA5LmpwZw pwCXRodW1iCTU3NXgzMjMjCmUJanBn/88cf4f4f/c2c/Coral-Bleaching.jpg[/IMG]
Australia has an**unced the "worst mass bleaching event" in the **rthern parts of the Great Barrier Reef. Coral bleaching occurs when waters reach certain temperatures, causing corals to expel algae. The cause is a combination of an El Niño event in the Pacific Ocean and human-caused global warming