Within 50-100 years, there might not be any coral left on the planet, so efforts are underway to freeze samples of coral in the hopes that maybe future generations care enough to resurrect the ecosystem:
Now the problem is that even if we have some of the coral, what about the millions of arthorpods, fish, sponges, mollusks, cnidarians, and countless other genera that rely on coral? I think that this thing is basically just a publicity stunt, to tell you the truth - having a few frozen coral embryos isn't going to bring it back, but having better maritime laws and aquatic national parks might go a long way towards helping the reefs.
I mean, we are all about saving the rainforest, so why don't we give more of a damn about the aquatic version? I think that the only two nations on the planet that have labeled underwater ecosystems as protected are the United States and Australia, and Australia has only done so within the last few years (I hope I'm wrong about that, but those are the only two places that I've ever heard of). We should get on this! Just because we aren't a species of fish, doesn't mean coral isn't an important part of our world. For example, most of the photosynthesis on the planet happens to be done by coral, and corals are a great carbon sink as their exoskeleton is made from calcium carbonate. They preserve islands by growing protective rings around them to slow down erosion. The biomedical research potential is enormous - there are far more species with potential pharmaceutical value in the oceans than there is on land, far far more.
So, what can be done? How do we save the corals?