Summary:
- The Great Barrier Reef in Australia has reached "catastrophic" levels of coral bleaching, according to a new study.
- Coral bleaching is a phenomenon where corals expel the symbiotic algae that provide them with energy, leading to the corals turning white and often dying.
- The study found that the Great Barrier Reef experienced its sixth mass bleaching event in 2022, with 91% of the reef showing some level of bleaching, indicating the severity of the situation and the need for urgent action to protect this vital ecosystem.