It's also inherently a problem that we're going to lose lots of plant and animal species that depend on the coral reefs, simply because those plants and animals

It's also inherently a problem that we're going to lose lots of plant and animal species that depend on the coral reefs, simply because those plants and animals are beautiful and we will have been responsible for their deaths. "Well don't worry, we'll just get food from somewhere else" is not a real answer. At some point, life on a dead planet just isn't worth it anymore.