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coral bleaching
Highest Ocean Heat in 400 Years Poses 'Existential Threat' to Great Barrier Reef
"In the absence of rapid, coordinated, and ambitious global action to combat climate change, we will likely be witness to the demise of one of Earth's great natural wonders," the authors of a study in Science wrote.
Aug 08, 2024
The Great Barrier Reef recently experienced the highest ocean temperatures in at least four centuries and faces an "existential threat" due to repeated mass coral bleaching episodes, a study published Wednesday in Science found.
The network of coral reefs off of Australia—the world's largest living structure—has faced five of the six hottest three-month periods of average surface temperature ever recorded just since 2016, each of which was accompanied by devastating coral bleaching.
Ocean temperatures around the reef reached a record-breaking extreme from January to March this year, with the three-month mean temperature 1.73°C higher than the pre-1900 average, according to the study, authored by researchers based in Australia.
The study includes climate modeling that attributes the temperatures to fossil fuel-driven carbon emissions, and concludes that urgent climate action is needed.
"This attribution, together with the recent ocean temperature extremes, post-1900 warming trend, and observed mass coral bleaching, shows that the existential threat to the Great Barrier Reef ecosystem from anthropogenic climate change is now realized," the study says.
"In the absence of rapid, coordinated, and ambitious global action to combat climate change, we will likely be witness to the demise of one of Earth's great natural wonders," the authors also wrote.
The Great Barrier Reef is under critical pressure, with warming sea temperatures and mass coral bleaching events threatening to destroy the remarkable ecology, biodiversity, and beauty of the world’s largest coral reef, according to research in @nature. https://t.co/67bXgmfTEn
— Robin Hicks (@RobinHicks_) August 8, 2024
The researchers estimated the surface temperatures for 1618-1899 by using a reconstruction method based on drilling into coral skeletons and analyzing the chemical makeup. For the period from 1900 to 1995, they used both the reconstruction method and measurements by modern instruments, and for the last 30 years they used instrumental data.
They found that temperatures were relatively stable until 1900 but have climbed steadily since, especially since 1960.
The trend has culminated in a series of bleaching events, in which stressed corals expel the microscopic algae in their tissues and become transparent or white. Without the helpful algae, which live inside them symbiotically, corals are at risk of disease and death.
In interviews with journalists, the study authors spoke about the severity of the threat to the Great Barrier Reef and the urgent need for climate action.
"The heat extremes are occurring too often for those corals to effectively adapt and evolve," Ben Henley, a paleoclimatologist at the University of Melbourne and lead author of the study, toldThe New York Times. "If we don't divert from our current course, our generation will likely witness the demise of one of Earth's great natural wonders, the Great Barrier Reef."
Henley said he snorkeled with his father on the Great Barrier Reef as a child.
"You can't even take in the diversity," he said. "It's a kaleidoscope of color, it's absolutely spectacular."
He said he worries that his own 2-year-old daughter may not be able to enjoy the same experience.
"In her childhood years the reef is likely to see immense destruction," he said.
He called for strong global action so that his daughter and members of her generation could "marvel at the reef in their lifetimes."
Helen McGregor, a scientist at the University of Wollongong and study co-author, told the BBC the new research "could send a huge signal to the world about how grave the problem is."
"We know what we need to do," she added. "We have international agreements in place [to limit global temperature rise]."
Scientists not involved in the study agreed about the importance of the research, not just for the Great Barrier Reef but for coral reefs more generally.
"It's a stunningly important summary of the history of the world's largest reef system," Stephen Palumbi, a marine biologist at Stanford University, told the Times. "The paper lays out the danger that corals all around the world face from this heat."
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False Climate Solution of Geoengineering Could Cause Heatwaves Thousands of Miles Away
"We need more regional geoengineering modeling studies like this work to characterize these unintended side effects before they have a chance to play out in the real world," said the study's lead author.
Jun 21, 2024
A study published Friday found that a cloud engineering technique designed to cool parts of the western United States could inadvertently stoke heatwaves from North America to Europe, underscoring why many scientists reject geoengineering as a false climate solution.
The study, published in the journal Nature Climate Change, concludes that marine cloud brightening (MCB)—"a geoengineering proposal to cool atmospheric temperatures and reduce climate change impacts"—in the "remote mid-latitudes or proximate subtropics" of the northern Pacific Ocean—would decrease "the relative risk of dangerous summer heat exposure by 55% and 16%, respectively."
However, the researchers found that regions including Africa's Sahel, central North America, Europe, and northeastern Asia would "experience exacerbated heat stress and hotter summers with MCB than would otherwise occur under global warming."
Additionally, the study shows that MCB would be less effective over time and could "even increase heat stress in the western United States" and beyond by mid-century.
University of California San Diego researcher Jessica Wan, who led the study, toldThe Guardian that MCB "can be very effective for the U.S. West Coast if done now, but it may be ineffective there in the future and could cause heatwaves in Europe."
The study's authors said the paper's findings are especially troubling given the dearth of international MCB regulation.
"There is really no solar geoengineering governance right now. That is scary," said Wan. "Science and policy need to be developed together. We don't want to be in a situation where one region is forced to do geoengineering to combat what another part of the world has done to respond to droughts and heatwaves."
As New Scientistreported:
The MCB experiments that have taken place so far in Australia and California haven't been of a sufficiently large scale to cause detectable climate effects, but they suggest that regional geoengineering could be closer to reality than previously thought, says Wan. "We need more regional geoengineering modeling studies like this work to characterize these unintended side effects before they have a chance to play out in the real world."
In Australia, researchers are experimenting with geoengineering techniques in an effort to cool the Great Barrier Reef and decelerate its bleaching. In California, scientists from the University of Washington sprayed sea salt flecks over a decommissioned aircraft carrier in the San Francisco Bay in hushed testing that was halted by the city of Alameda last month over safety concerns.
"We strongly welcome Alameda City Council's unanimous decision to say no to the first open-air marine cloud brightening experiment in the U.S.," Mary Church of the Center for International Environmental Law said after the halt. "Key concerns raised by council members focused on lack of sufficient information, notice, and transparency. The rejection rightfully reflects the gravity of what's at stake for both local and global communities."
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Some Journalists Get It: Fossil Fuel Giants Are Directly to Blame for Coral Bleaching
These few coral-focused pieces offer hope that some outlets might be improving their climate reporting practices to include accountability.
May 25, 2024
Record levels of heat in the ocean are causing once-colorful coral reefs around the world to bleach a ghostly white. In April, the National Oceanic and Atmospheric Administration (NOAA) announced the planet’s fourth mass coral-bleaching event on record—the second in the last decade.
While they might look like plants, corals are actually invertebrate animals related to jellyfish. They get their vibrant colors from tiny algae that live on them and provide them with food. But when ocean temperatures become too hot, corals get stressed and expel the algae, losing their food source and color. Starving coral can recover if their environments improve, but the International Panel on Climate Change (IPCC) predicts that even with the Paris agreement’s allotted warming of 1.5°C over preindustrial levels, 70–90% of the world’s coral reefs will still die.
In order to give the public the most complete understanding of what’s going on—and how we can fix it—reporting on coral bleaching should not only link the phenomenon to climate change, but link climate change to its main culprit: the fossil fuel industry.
Because coral reefs provide such vibrant ecosystems for sea life, mass coral death will impact economies and food security for humans as well. By protecting coasts, sustaining fisheries, generating tourism, and creating jobs, it is estimated that coral reefs provide ecosystem services worth trillions of dollars each year (MIT Science Policy Review, 8/20/20; GCRMN, 10/5/21).
In the past year alone, we’ve seen staggering and unprecedented ocean temperatures amid widespread heatwaves. Last summer, water temperatures of more than 100°F were recorded off the coast of Florida (ABC,7/25/23). Scientists say the El Niño weather phenomenon, solar activity, and a massive underwater volcanic eruption have played a role in recent supercharged ocean temperatures, but the biggest cause of this coral crisis is undisputed: climate change. The IPCC reports that it’s “virtually certain” ocean temperatures have risen unabated since 1970, absorbing more than 90% of excess heat from the climate system. We also know that the burning of fossil fuels changes the climate more than any other human activity does.
Therefore, in order to give the public the most complete understanding of what’s going on—and how we can fix it—reporting on coral bleaching should not only link the phenomenon to climate change, but link climate change to its main culprit: the fossil fuel industry. While much reporting deserves credit for clearly making this connection, some reports from major outlets were still behind, implying the climate crisis might be some sort of act of God, rather than something humans have caused—and have the power to mitigate.
Good News About Bad News
Coral bleaching is bad news, but I’d like to take a rare moment to highlight the good news, too: A lot of reporting on this crisis was thorough, setting a solid example of how the increasing number of climate change-related phenomena should be reported on.
Vox (4/26/24) dedicated a whole piece to climate change’s effects on coral, making that fossil fuel connection. Senior environmental reporter Benji Jones wrote:
Ultimately, the only real solution is reducing carbon emissions. Period. Pretty much every marine scientist I’ve talked to agrees. “Without international cooperation to break our dependence on fossil fuels, coral bleaching events are only going to continue to increase in severity and frequency,” [NOAA marine scientist Derek] Manzello said.
The New York Times (4/15/24) made the fossil fuel connection, too, in an article by Catrin Einhorn: “Despite decades of warnings from scientists and pledges from leaders, nations are burning more fossil fuels than ever and greenhouse gas emissions continue to rise.”
NPR dedicated an episode of “All Things Considered” (4/17/24) to scientists’ work to breed heat-tolerant corals and algae, in hopes that they can help restore reefs. The piece, by Lauren Sommer and Ryan Kellman, outlined this work’s promise—and its limitations. Heat-tolerant algae may not share as many nutrients with the coral, potentially causing the coral to grow more slowly and reproduce later. Regulators will need to assess whether these lab-grown corals are safe for wild populations and their ecosystems as a whole. Logistically, the sheer amount of heat-tolerant coral needed to replace affected reefs is vast, and it’s only a temporary solution.
“It’s not our ‘get out of jail free’ card,” said Australian coral biologist Kate Quigley:
Maybe that gets us to 2030, 2050, for a very few number of species that we can work with. If we don’t have an ocean to put them back in that’s healthy, no amount of incredible technology or money is worth it.
The episode ended with an acknowledgment that these scientific mitigations are meant only to buy time while humans work to halt climate change, which will require “cutting heat-trapping emissions from the largest source—burning fossil fuels—and switching to alternative energy sources like solar and wind.”
“All Things Considered’s” coverage of the scientists’ work was impactful because it took time to explain that creating these heat-tolerant corals was an important mitigation, but that the ultimate solution is to cut fossil fuels. Without the latter, the former would be in vain.
Capable of Accountability
As a media critic for an organization that’s been at this since 1986, to me it’s heartening when news outlets’ work actually improves. It’s definitely not yet time to pop the champagne—there’s still a chronic lack of clear reporting linking climate disasters to fossil fuels, as FAIR has noted in coverage of last year’s wildfires (7/18/23, 8/25/23), climate protests (9/29/23), the potential breakdown of a crucial Atlantic current (7/31/23), overstating the potential of new carbon-capture technology (1/4/24), and more. But these few coral-focused pieces offer hope that some outlets might be improving their climate reporting practices to include accountability. At the very least, it proves they are certainly capable.
Aside from the effects of the climate crisis becoming harder and harder to ignore each year, there is a commendable movement to train journalists on how best to report on climate through a number of initiatives and organizations. There’s a lot of work to do, but these stories indicate progress since Big Media was applauding Big Oil’s efforts to clean up the Exxon Valdez oil spill in 1989 (Extra!, 3–4/90) and giving platforms to “scientists” on Big Oil’s payroll who asserted climate change was not occurring (Extra!, 11–12/04, 5–6/07).
The New Denial
Climate denial today is more nefarious. Due to the unanimity and widespread knowledge of the scientific consensus, respectable outlets can no longer parrot views that the Earth isn’t warming. What they can do is bury or gloss over information on its primary cause, who profits off of it, and what needs to be done to prevent it from getting much worse.
In a piece on the potential of artificial reefs to mitigate this crisis that linked coral bleaching to climate change, CNN’s Michelle Cohan (5/9/24) waited until the very last paragraph to mention the need to “curb climate-warming carbon emissions.” There’s nothing untrue about that statement, but it doesn’t tell you where those emissions come from, and leaves open the interpretation that “curbing” emissions can come from carbon capture and storage—a strategy that is largely industry greenwashing (FAIR.org, 1/4/24).
Despite likely short-form word limits, a solutions-oriented piece like this does a disservice to readers—and the scientists working on saving corals—by giving such an incomplete sketch of the necessary long-term change. It would benefit from a clear explanation that a) we need to phase out fossil fuels and b) alternative energy sources already exist, are reliable, and are more affordable than fossil fuels already. It’s not arduous or wordy to do so. “All Things Considered” did most of it in one sentence.
The feeling of alarm is justified, but journalists should remind readers that the coral bleaching crisis—and climate change as a whole—are not totally uncontrollable acts of nature.
An ABC piece (4/15/24) by Leah Sarnoff and Daniel Manzo covered the coral-bleaching event, but only mentioned climate change in passing toward the end. Otherwise, “warming oceans” were just depicted as something that happened, with no clear connection or cause.
In an article expressing the dire condition of the reefs, The Washington Post’s Rachel Pannett (4/18/24) likewise made the link to climate change only once: “Climate change is the greatest threat to the Great Barrier Reef, and coral reefs globally,” said Roger Beeden, the chief scientist of the Great Barrier Reef Marine Park Authority. There was another quote from a research director with the Australian nonprofit Climate Council, who merely noted that the bleaching of the Great Barrier Reef is “a disaster at our doorstep.”
It’s important to express the dire condition the reefs are in, and the devastating risks it poses to ocean and human life. But by only mentioning “climate change” in passing, and not discussing its causes, it comes across as a natural but unfortunate phenomenon. Not highlighting its causes means not highlighting its solutions, either. The result is a potentially paralyzing doomsday narrative that is more likely to dampen than galvanize necessary climate action—especially against fossil fuels.
‘Heat Stress’
Another Washington Post piece (4/15/24), by Amudalat Ajasa, mentioned the “heat stress” on corals, but not even climate change, let alone the culpability of fossil fuels. This piece quoted NOAA’s Manzello, saying that this global event should be a wake-up call, but didn’t elaborate on what that wake-up call would be for. Wake up to do what? This piece didn’t explain.
The piece also took a grave tone, describing the ghastly reefs off the coast of Florida, Australia, and the Caribbean island of Bonaire. It quoted Francesca Virdis, a chief operating officer at Reef Renewal Bonaire: “It’s hard to find a silver lining or a positive note with everything happening.”
The article explained the role of El Niño—a naturally occurring climate pattern that warms areas of the Pacific every 2 to 7 years—and the hope that it will soon let up and give way to La Niña, its cooler counterpart, but did not explain that the phenomenon plays a smaller role than ongoing, human-caused warming. The aforementioned Vox piece also discussed the role of El Niño, but was sure to specify that reefs have been collapsing long before this current crisis.
The feeling of alarm is justified, but journalists should remind readers that the coral bleaching crisis—and climate change as a whole—are not totally uncontrollable acts of nature. We know what is to blame. While it may be too late to avoid breaching the 1.5°C limit even if we cut emissions tomorrow, the sooner we cease burning fossil fuels, the more catastrophic impacts we’ll avoid.
The message is urgent and dire, but there’s plenty that humans—especially those in power—can do, and there’s plenty journalists can do to make the public aware.
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