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Coral reefs provide food for hundreds of millions of people, with reef fish species comprising about one-quarter of the total fish catch in less developed countries. They serve as natural protective barriers, sheltering coastal communities from the waves generated by hurricanes, typhoons, and cyclones. They are also the basis of employment through tourism for millions of people in the many regions with reefs in their coastal waters. Apart from these ecosystem services, valued in many billions of dollars, coral reefs have tremendous intrinsic value that is impossible to quantify as anyone who has snorkelled or dived on a healthy reef can attest—without coral reefs our planet and human society would be infinitely poorer.
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Philip V. Mladenov (Marine Biology: A Very Short Introduction)