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Coral Reefs are the "Rainforests" of the ocean. Reefs are ecologically important ecosystems and have a high biodiversity that serves as a storage bank of rich genetic resources. They are a source of food and medicine, and they protect the coast from wave erosion。However,climate change and ocean pollution will destroy the world's great coral reefs within a century, If the present rate of destruction continues, 70% of the world's coral reefs will be destroyed by the year 2050.The above discussion points to the fact that coral reefs are at risk of extinction.