Link:http://www.dailymail.co.uk/sciencetech/article-4542364/Satellites-capture-coral-bleaching-Great-Barrier-Reef.html

SATELLITES CAPTURE CORAL BLEACHING GREAT BARRIER REEF

Some ESA(European Space Agency) researchers used the Copernicus' sentinel-2 satellite to take images of the catastrophic death of coral of the Great Barrier Reef. These corals have undergone two bleaching events in successive years. This bleaching happens when the algae that live inside the corals are thrown out of the coral because of the water's high temperatures. This alga is essential for coral's survival. Experts are concerned about coral reef's great survival ability in global-warming induced events such as the rising temperatures of the waters. When temperatures drop and the algae return to the coral, some coral recover but some others die.