Environmentalists are always looking for allies who can blast away treehugger stereotypes. They should consider reaching out to the community of anyone who's ever gone snorkeling in a coral reef. (You remember that part of your Cancun vacation, don't you? It happened sometime between the margaritas and the … margaritas.) According to a new book called Our Dying Planet , humanity is on track to wipe out all coral reefs . No more bright, awesome fish and crazy plants. Ever. The book, written by Peter Sale, a former professor at the University of Sydney who’s now at the United Nations University, says that this will be "a new first for mankind — the 'extinction' of an entire ecosystem." We'd say it's more like a new low.