Coral reefs are one of the most diverse and important ecosystems on Earth. Not only do they provide food and habitats for the fish and seafood we eat, but they also shelter many other organisms that are crucial for ocean food chains. Experts estimate coral reefs contribute about $30 billion USD to the global economy annually, through tourism, fisheries, and coastal protection. Unfortunately, warming ocean waters, acidification, and over-fishing are killing the beautiful reefs at unprecedented levels.