Two reef scientists announced on Monday that coral reefs around the world are experiencing a mass bleaching event as the climate crisis drives record-breaking ocean heat, warning that this could become the worst bleaching period in recorded history. Corals die from extreme or prolonged heat stress, but if temperatures drop and other stressors like pollution and overfishing are lessened, there may be a chance for recovery. Derek Manzello of the US National Oceanic and Atmospheric Administration (NOAA) said that coral bleaching is becoming more frequent and severe as the world’s oceans continue …