Hawaii has passed a law banning certain sunscreens whose chemicals are thought to harm coral reefs. It is smart environmentalism and smart PR. The state has thrust itself into the forefront of places where efforts are being taken to keep reefs healthy. The worldwide problem of coral destruction is not going to be stopped by the banning of two chemicals but it will help. Coral bleaching is thought to derive from warmer water temperatures. The banned sunscreens won’t help with that, but they will lower potential harm the state’s reefs are suffering as they adapt to global weather change.