> Coral reefs are some of the most diverse and valuable ecosystems on Earth. Home to over 4,000 species of fish, corals, and other marine life, coral reefs cover only 1% of the world’s oceans, but provide habitat for at least 25% of the world’s marine life, with many reef species still to be discovered.

https://oceanservice.noaa.gov/education/tutorial_corals/cora...

> Coral reefs have an estimated global value of £6 trillion each year, due in part to their contribution to fishing and tourism industries and the coastal protection they provide.

https://www.nhm.ac.uk/discover/quick-questions/why-are-coral...