scientists trying to send a warning from down under. >> reporter: it's one of the seven natural wonders of the world. the great barrier rev off the coast of australia, a vibrant underwater ecosystem of coral and sea life that's roughly the size of italy, so huge you can actually see it from space. scientists are sounding the alarm. they say for the second year in a row this sprawling underwater treasure is bleaching on a massive scale. a new study by australia's arc center of excellence for coral rev studies shows approximately two-thirds of the rev is suffering. >> it's quite terrifying actually. the -- the magnitude and severity of the event. >> reporter: sean connolly is one of a team of scientists who have been surveying the damage. >> a coral is a partnership between an animal which is what builds the skeleton and constructs the reefs that you see and the tiny one-celled algae and hot temperatures cause

Related Keywords

Reporter , Coral , Scientists , Warning , Ecosystem , Rev , Australia , Coast , Barrier , Sea Life , Seven Natural Wonders Of The World , Down Under , One , Seven , Bleaching , Space , Scale , Size , Alarm , Row , Underwater Treasure , Italy , Event , Suffering , Marc Center , Coral Rev Studies , Excellence , Magnitude , Severity , Sean Connolly , Two , Reefs , Animal , Partnership , Algae , Democratic Party , Skeleton , Temperatures , Constructs , Damage ,