MELBOURNE: The Great Barrier Reef has experienced its greatest annual loss of live coral across most of its expanse in four decades of record-keeping, Australian authorities say.
But due to increasing coral cover since 2017, the coral deaths — caused mainly by bleaching last year associated with climate change — have left the area of living coral across the iconic reef system close to its long-term average, the Australian Institute of Marine Science said in its annual survey on Wednesday.
The change underscores a new level of volatility on the UNESCO World Heritage Site, the report said.
Mike Emslie, who heads the tropical marine research agency’s long-term monitoring program, said the live coral cover measured in 2024 was the largest recorded in 39 years of surveys.
The losses from such a high base of coral cover had partially cushioned the serious climate impacts on the world’s largest reef ecosystem, which covers 344,000 square kilometers (133,000 square miles) off the northeast Australian coast, he said.
“These are substantial impacts and evidence that the increasing frequency of coral bleaching is really starting to have detrimental effects on the Great Barrier Reef,” Emslie said on Thursday.
“While there’s still a lot of coral cover out there, these are record declines that we have seen in any one year of monitoring,” he added.
Emslie’s agency divides the Great Barrier Reef, which extends 1,500 kilometers (900 miles) along the Queensland state coast, into three similarly-sized regions: northern, central and southern.
Living coral cover shrunk by almost a third in the south in a year, a quarter in the north and by 14 percent in the central region, the report said.
Because of record global heat in 2023 and 2024, the world is still going through its biggest — and fourth ever recorded — mass coral bleaching event on record, with heat stress hurting nearly 84 percent of the world’s coral reef area, including the Great Barrier Reef, according to the US National Oceanic and Atmospheric Administration’s coral reef watch. So far at least 83 countries have been impacted.
This bleaching event started in January 2023 and was declared a global crisis in April 2024. It easily eclipsed the previous biggest global coral bleaching event, from 2014 to 2017, when 68.2 percent had bleaching from heat stress.
Large areas around Australia — but not the Great Barrier Reef — hit the maximum or near maximum of bleaching alert status during this latest event. Australia in March this year started aerial surveys of 281 reefs across the Torres Strait and the entire northern Great Barrier Reef and found widespread coral bleaching. Of the 281 reefs, 78 were more than 30 percent bleached.
Coral has a hard time thriving and at times even surviving in prolonged hot water. They can survive short bursts, but once certain thresholds of weeks and high temperatures are passed, the coral is bleached, which means it turns white because it expels the algae that live in the tissue and give them their colors. Bleached corals are not dead, but they are weaker and more vulnerable to disease.
Coral reefs often bounce back from these mass global bleaching events, but often they are not as strong as they were before.
Coral reefs are considered a “unique and threatened system” due to climate change and are especially vulnerable to global warming beyond 1.5 degrees Celsius (2.7 degrees Fahrenheit) since pre-industrial times, the United Nations Intergovernmental Panel on Climate Change proclaimed in 2018. The world has now warmed 1.3 degrees Celsius since pre-industrial times. That report said “tropical corals may be even more vulnerable to climate change than indicated in assessments made in 2014.”
The report said back-to-back big bleaching events at the Great Barrier Reef in the mid 2010s “suggest that the research community may have underestimated climate risks for coral reefs.”
“Warm water (tropical) coral reefs are projected to reach a very high risk of impact at 1.2°C, with most available evidence suggesting that coral-dominated ecosystems will be non-existent at this temperature or higher. At this point, coral abundance will be near zero at many locations,” the report said.
Great Barrier Reef records largest annual coral loss in 39 years
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Great Barrier Reef records largest annual coral loss in 39 years
- Australian authorities say the Great Barrier Reef has experienced its greatest annual loss of live coral in four decades
- But due to increasing coral cover since 2017, the coral deaths — caused mainly by bleaching last year associated with climate change — have left the area of living coral across the iconic reef system close to its long-term average
Afghanistan says it thwarted Pakistani airstrike on Bagram Air Base as fighting enters fourth day
- The fighting has been the most severe between the neighbors for years
- Pakistan accuses Taliban government of harboring militant groups that stage attacks against it
KABUL: Afghanistan thwarted attempted airstrikes on Bagram Air Base, the former US military base north of Kabul, authorities said Sunday, while cross-border fighting between Pakistan and Afghanistan stretched into a fourth day.
The fighting has been the most severe between the neighbors for years, with Pakistan declaring that it’s in “open war” with Afghanistan.
The conflict has alarmed the international community, particularly as the area is one where other militant organizations, including Al-Qaeda and the Daesh group, still have a presence and have been trying to resurface.
Pakistan accuses Afghanistan’s Taliban government of harboring militant groups that stage attacks against it and also of allying with its archrival India.
Border clashes in October killed dozens of soldiers, civilians and suspected militants until a Qatari-mediated ceasefire ended the intense fighting. But several rounds of peace talks in Turkiye in November failed to produce a lasting agreement, and the two sides have occasionally traded fire since then.
On Sunday, the police headquarters of Parwan province, where Bagram is located, said in a statement that several Pakistani military jets had entered Afghan airspace “and attempted to bomb Bagram Air Base” at around 5 a.m.
The statement said Afghan forces responded with “anti-aircraft and missile defense systems” and had managed to thwart the attack.
There was no immediate response from Pakistan’s military or government regarding Kabul’s claim of attempted airstrikes on Bagram or the ongoing fighting.
Bagram was the United States’ largest military base in Afghanistan. It was taken over by the Taliban as they swept across the country and took control in the wake of the chaotic US withdrawal from the country in 2021. Last year, US President Donald Trump suggested he wanted to reestablish a US presence at the base.
The current fighting began when Afghanistan launched a broad cross-border attack on Thursday night, saying it was in retaliation for Pakistani airstrikes the previous Sunday.
Pakistan had said its airstrike had targeted the outlawed Pakistani Taliban, also known as Tehreek-e-Taliban Pakistan, or TTP. Afghanistan had said only civilians were killed.
The TTP militant group, which is separate but closely allied with Afghanistan’s ruling Taliban, operates inside Pakistan, where it has been blamed for hundreds of deaths in bombings and other attacks over the years.
Pakistan accuses Afghanistan’s Taliban government of providing a safe haven within Afghanistan for the TTP, an accusation that Afghanistan denies.
After Thursday’s Afghan attack, Pakistani Defense Minister Khawaja Mohammad Asif declared that “our patience has now run out. Now it is open war between us.”
In the ongoing fighting, each side claims to have killed hundreds of the other side’s forces — and both governments put their own casualties at drastically lower numbers.
Two Pakistani security officials said that Pakistani ground forces were still in control on Sunday of a key Afghan post and a 32-square-kilometer area in the southern Zhob sector near Kandahar province, after having seized it during fighting Friday. The captured post and surrounding area remain under Pakistani control, they added. The officials spoke on condition of anonymity, because they weren’t authorized to speak publicly.
In Kabul, the Afghan government rejected Pakistan’s claims. Deputy government spokesman Hamdullah Fitrat called the reports “baseless.”
Afghan officials said that fighting had continued overnight and into Sunday in the border areas.
The police command spokesman for Nangarhar province, Said Tayyeb Hammad, said that anti-aircraft missiles were used from the provincial capital, Jalalabad, and surrounding areas on Pakistani fighter jets flying overhead Sunday morning.
Defense Ministry spokesman Enayatulah Khowarazmi said that Afghan forces had launched counterattacks with snipers across the border from Nangarhar, Paktia, Khost and Kandahar provinces overnight. He said that two Pakistani drones had been shot down and dozens of Pakistani soldiers had been killed.
Fitrat said that Pakistani drone attacks hit civilian homes in Nangarhar province late Saturday, killing a woman and a child, while mortar fire killed another civilian when it hit a home in Paktia province.
There was no immediate response to the claims from Pakistani officials.
