Scientists are sounding the alarm: new evidence shows global warming may be pushing humanity toward a point of no return. The Great Barrier Reef (GBR) is the world’s largest coral reef, stretching 2,500 kilometers along Australia’s northeastern coast. It covers about 344,400 square kilometers, making it the largest natural structure created by living organisms, and it can even be seen from space. But the ecosystem of this colossal reef is under threat: the climate crisis is killing increasing numbers of corals.
What are researchers warning about? Researchers say the Great Barrier Reef is nearing an irreversible “critical point” as it keeps taking hits from global warming. Some areas have recorded the highest levels of coral mortality in the history of observations. The Australian Institute of Marine Science (AIMS), which started monitoring the GBR in 1985, surveyed 19 reefs from August to October this year; during that period, 12 of the reefs showed a reduction in coral cover. AIMS director Dr. Mike Emslie said one of the main factors driving coral loss is thermal stress caused by climate change. AIMS has also confirmed the fifth mass bleaching event on the reef in the last eight years. Ongoing heat, pollution, and changing tides are causing corals to expel the algae that live in their tissues, which strips the corals of their color and leaves them white.
If heat stress continues to hit the reef, the algae may not recover and the corals will die. In the coming months, AIMS plans to survey several more reefs. While bleached corals are not dead, they face a much higher risk of mortality. These die-offs are becoming increasingly common as the climate crisis accelerates, a trend reported by the Daily Mail. Previous studies have shown that corals can recover from bleaching if they quickly receive nutrients; without those nutrients, corals can perish within a few days.
