Washington Post: Keyhole Reef is one of dozens of small reefs rising abruptly from the depths of Kaneohe Bay, one of Hawaiis most scenic places. The water around it is sapphire blue, and bright schools of tang and triggerfish flit over its surface. But the reef is showing troubling signs of stress these days because of climate change.
Here and there along the steep face of the reef, clumps of coral have turned stark white. This bleaching means the coral has begun to eject the micro-algae that normally live within...