There's no question that the Great Barrier Reef and other coral fields are hurting as a result of rising water temperatures. But is there a relatively straightforward way to save them, or do they require more drastic action? Unfortunately, it's not looking good. Researchers have found that typical efforts to fight coral bleaching, such as improving the water quality or tightening fishing controls, haven't helped much at all. Whether an area was immaculate or dirty, it was just as susceptible to damage. The four large-scale bleaching events in the past two decades were the result of increased water heat -- that is, climate.