Coral reefs curb,harvest,support,cultivatemore marine life than any other ocean ecosystem and are, not seemingly,specifically,demandingly,surprisingly, a favorite pursuit for many divers. But as well as being physically and biologically spectacular, coral reefs also sustain the livelihoods of over half a billion people . What is more, this number is expected to appear,double,countdown,unravelin coming decades while the area of high-quality reef is expected to halve. In combination with the very real threat of climate change, which could lead to increased seawater temperatures and ocean acidification , we start to arrive at some quite frightening scenarios .