Great Barrier Reef faces severe bleaching: more areas likely to die

Some 22% of corals over the entire reef are dead; climate change and coal mining threaten the rest
Some 22% of corals over the entire reef are dead; climate change and coal mining threaten the rest
Vast areas of Great Barrier Reef unable to recover from climate change; coal mines present even more risk

The embattled Great Barrier Reef could face more severe coral bleaching in the coming month, with areas badly hit by last year’s event at risk of death, the Guardian reports today.

Images taken by local divers last week and shared by the Australian Marine Conservation Society show newly bleached corals discovered near Palm Island, 225km south of Cairns.

Most of the reef has been placed on red alert for coral bleaching for the coming month by the US National Oceanic and Atmospheric Administration.

Its satellite thermal maps have projected unusually warm waters off eastern Australia after an extreme heatwave just over a week ago saw temperatures top 47C in parts of the country.

According to the reef’s marine park authority, sea surface temperatures from Cape Tribulation to Townsville have been up to 2C higher than normal for more than a month.

The NOAA coral reef watch’s forecast for the next four weeks has placed an even higher level alert on parts of the far northern, northern and central reef, indicating mortality is likely.

Corals south of Cairns, in the Whitsundays and parts of the far northern reef that were badly hit by last year’s mass bleaching event are at fatal risk.

Imogen Zethoven, the conservation society’s Great Barrier Reef campaign director, said projections, plus evidence of new coral bleaching, were extremely concerning.

The bleaching that occurred over eight to nine months of last year was the worst-ever on record for the reef, with as much as 85% of coral between Cape York and Lizard Island dying.

Some 22% of corals over the entire reef are dead.

Zethoven pointed to NOAA projections that severe bleaching would occur every year by 2043 if nothing was done to reduce emissions.

“The reef will be gone before annual severe bleaching,” she said. “It won’t survive even biennial bleaching.”

The $1b reef fund announced by prime minister Malcolm Turnbull last year was a “cynical rebadging exercise” undercut by its support for fossil fuel initiatives such as Adani’s Carmichael coalmine “that will spell catastrophe for the reef”, Zethoven said.

“There’s no doubt about that anymore,” she said. “They know what they are doing and they should come clean with the Australian public that they have no interest in the long-term survival of the Great Barrier Reef.

“To the average person on the street, that’s what it looks like. And if the government thinks that’s not the case, they’re out of touch.”

In December the government granted conditional approval for a $1b loan to Adani for its Carmichael coalmine and rail project in central Queensland, which could produce 60m tonnes of coal annually for 60 years.

Warmer ocean temperatures brought about by climate change are a key factor in coral bleaching. Polling suggests more than two-thirds of Australians believe the reef’s condition should be declared a national emergency.

Zethoven said the government had made “a very deliberate decision to go down the coal road”, despite it jeopardising the reef as well as 70,000 jobs in regional Queensland that depend on it.

John Rumney, a Port Douglas diving operator, said the commercial advantage to saving the reef went beyond jobs. Much of coastal Queensland was majorly invested in reef tourism, he said.

The government’s measures to save the reef were hypocrisy when it was actively supporting “the cause of the cancer – the worst cause”.

“It’s immoral that those of us who are making our living from a healthy environment are paying taxes to subsidise infrastructure that’s going to cause climate change in a major way for the next 50 years,” he said.

“If this all goes ahead, we’re basically dooming our tourism industry.”

Rumney said he had seen new and extensive bleaching of corals from Cairns to Townsville.

“There are definite large areas of mortality. Before, the reef has bleached and recovered. Now we’re talking about how often is it bleaching and what percentage is left.”

Areas that suffered in last year’s event were now less resilient and there seemed to be less coral strong enough to spawn.

Climate change-induced mass bleaching increasingly resembled a catastrophe the reef would be unable to recover from, he said.

“It’s weaker, just like humans,” Rumney said. “If you’re already down and out with a cold or cancer, you’re less resilient – the next thing that comes along is going to knock you back more.

“It’s the continual onslaught that will eventually kill the reef.”



Let us keep you up to date with our weekly MiNDFOOD e-newsletters which include the weekly menu plan, health and news updates or tempt your taste buds with the MiNDFOOD Daily Recipe. 

Member Login