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The annual global economic value of coral reefs is estimated between US–375 billion.However, coral reefs are fragile ecosystems, partly because they are very sensitive to water temperature.They are under threat from climate change, oceanic acidification, blast fishing, cyanide fishing for aquarium fish, sunscreen use, Most of the coral reefs we can see today were formed after the last glacial period when melting ice caused the sea level to rise and flood the continental shelves.This means that most modern coral reefs are less than 10,000 years old.The corals could then overgrow the hills, forming the present cays and reefs.Sea level on the Great Barrier Reef has not changed significantly in the last 6,000 years, Although the Great Barrier Reef formed along a continental shelf, and not around a volcanic island, Darwin's principles apply.

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Like sea level rise, a rapidly subsiding bottom can overwhelm coral growth, killing the coral polyps and the reef, due to what is called coral drowning.

If the land subsides slowly, the fringing reefs keep pace by growing upwards on a base of older, dead coral, forming a barrier reef enclosing a lagoon between the reef and the land.