They're called the "rainforest of the sea" for a reason. First 25% of the oceans'fishes are dependant on the coral reefs. A single coral reef can hold 4000 fish species or more.
Attributed to @sgr with CC-BY. found on Called "school of fishes on corals ". The place is Suizokuk , Nagoya-shi, Japan Published on August 8, 2018
Ahmed Areef Maldives, Maldives Published on June 29, 2020 "https://unsplash.com/photos/xSTZPuSmI8A"
Corals reduce damage caused by tropical storms and waves. The coral structures reduce wave energy by 97% and it's a natural flood defense along most of the world's coastline
The main reason is because of coral bleaching. Bleaching is when the corals lose their colors. The loss of color means the coral is dying. Considering all the major benefits of coral bleaching, when corals die there are major negative reactions like mass extinction. Coral bleaching causes humans to rely on expensive manmade barriers to protect them from violent waves,reduce fish poulation, and increase the temperture which is ironic because....
It is climate change.
Other than the reducing your carbon footprint, there is also more research being done on coral which have actaully been beneficial. However, more ocean exploration is needed becuase only the surface has been scratched