Coral reefs, often called the underwater rainforests, are in serious trouble. They support about a third of all marine species and a billion people. But right now, more than 80% of the world’s reefs have been hit by bleaching. This is the worst global bleaching event ever recorded.

    The heat has been intense. It has spread across the Pacific, Atlantic, and Indian oceans, damaging and killing countless corals. This isn’t just a small problem. It’s a big deal because it shows that ocean warming has reached a point where there’s no safe place left for corals.

    Scientists have been tracking this. They’ve seen bleaching in at least 82 countries and territories since January 2023. Even places that were thought to be safe from heat have been affected. This includes spots like Raja Ampat and the Gulf of Eilat.

    Some areas have seen bleaching for two years straight. Australia’s Great Barrier Reef, the world’s biggest reef system, has had six widespread bleaching events in just nine years. The Ningaloo reef off Western Australia has also seen record-high heat stress.

    Scientists are worried. They’ve seen bleaching in places like Madagascar, the east African coast, and even South Africa’s iSimangaliso wetland park. The event is unprecedented, and it’s overwhelming the people who monitor and protect these reefs.

    Coral bleaching can be devastating. Corals can recover if the heat isn’t too extreme, but many surveys show widespread coral death. In Florida, an average of one in five corals were lost. In Mexico, one area lost between 50% and 93% of its corals. Almost a quarter of corals were killed by heat in the Chagos Islands.

    The Great Barrier Reef has been hit hard. After bleaching in early 2024, 40% of corals died in one area. Scientists described a “graveyard of dead corals. ” The heat was so extreme that Coral Reef Watch had to add three new threat levels to its alert system.

    The impact is devastating. Reef-building corals, like elkhorns, help protect coastlines and support other marine life. Many of these corals have died in just a few weeks. Scientists feel helpless as they document the loss.

    World leaders need to take action. They need to reduce fossil fuels and invest in clean energy. This isn’t just about the environment. It’s about the people who rely on these reefs for their livelihoods and survival.

Coral Reefs in Crisis: A Global Heatwave Impact

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