Coral reefs are under tremendous pressure from climate change, ocean acidification, and overfishing. A growing number are bleached a deathly white. This year has seen the worst global coral bleaching event since 1998, Nick Graham, a marine ecologist at Lancaster University, told me. (Coral bleaching happens when the water warms and colourful algae, called zooxanthellae, dies off. The coral dies if it gets bad enough.)
Full story in Motherboard: http://motherboard.vice.com/read/one-fifth-of-the-global-population-risks-malnutrition-as-fish-stocks-decline.