More than 80% of the world's coral reefs hit by worst bleaching event in recorded history / Coral reefs exude myriad chemicals, fueling dynamic microbial recycling of nutrients / Transcript: Coral Reefs / Shark removal a thorny issue for coral reefs / Nanotech reveals how harmful microplastics stick to coral reefs / Stem cell transplants could save the world's corals, say researchers / Is it time to give up trying to save coral reefs? My research says no / Deeper corals may help shallow reefs recover in the Florida keys / Huge gas fields under a coral reef--will a rejection on environmental grounds stop Woodside's Browse project? / As record heat risks bleaching 73% of the world's coral reefs, scientists ask 'what do we do now?'