The Great Barrier Reef suffers another mass bleaching
Warm waters triggered widespread coral bleaching across the world's largest reef system, the latest in a series of damaging events.
The Great Barrier Reef suffered another mass bleaching event this year, as unusually warm ocean waters triggered widespread damage across the world's largest coral reef system, the latest in a series of bleaching episodes that have battered the natural wonder with alarming frequency.
Coral bleaching occurs when corals, stressed by elevated water temperatures, expel the colourful algae that live within them and provide them with food and their vivid colours, turning them a ghostly white. If the stress is prolonged or severe, the corals can starve and die.
Aerial and underwater surveys revealed bleaching across large stretches of the reef, which extends for more than 2,000 kilometres along the Australian coast. The event was especially concerning because it occurred during a La Niña year, a weather pattern that typically brings cooler conditions, underscoring how much background ocean warming has raised the baseline risk.
The Great Barrier Reef has endured multiple mass bleaching events in a short span of years, a frequency that gives the corals little time to recover between blows. Scientists warn that at current rates of warming, such events will become more frequent and severe, threatening the long-term survival of the reef.
The reef is not only a UNESCO World Heritage site and an ecosystem of extraordinary biodiversity but also a vital economic resource. Its repeated bleaching has become one of the most visible and poignant symbols of the toll that a warming ocean is taking on life beneath the waves, and a warning of what rising temperatures hold for coral reefs worldwide.