In 1998, scientists recorded world's first mass bleaching event, years later study finds global coral cover well below normal levels as reefs at risk of irreversible decline threatening marine life, ocean livelihood, El Nino weather raises fears

In 1998, scientists recorded world's first mass bleaching event, years later study finds global coral cover well below normal levels as reefs at risk of irreversible decline threatening marine life, ocean livelihood, El Nino weather raises fears