Cold-blooded sea creatures seeking refuge from warming ocean waters may find themselves at increasing risk of deadly cold shocks due to changes in ocean currents, new research warns.
Climate change is pushing species to higher latitudes in an attempt to stay within their range of comfortable temperatures, but this migration can come with unforeseen consequences.
The new study, published in Nature, documents a mass mortality event in March 2021 that saw at least 260 dead sea creatures wash up on the shores of South Africa.
Using satellite data, ocean observations and data on the movements of bull sharks, the researchers link the event to a sudden influx of cold water coming up from the deeper ocean.
They also show that such events have been increasing in frequency over the past three decades and forecast that this trend may continue into the future as the world continues to warm.
One of the study authors tells Carbon Brief that “we predict this is going to become a more regular phenomenon and could impact a lot of different species”.
Marine migration
As the Earth warms, many species that are able to do so are migrating to higher latitudes, allowing them to maintain their place within their “thermal niche” – the set of temperatures at which they can comfortably survive.
Nowhere is this effect more pronounced than in the global oceans, where there are fewer barriers to migration than there are on land. On average, highly mobile marine species have been moving polewards by nearly 60km per decade since the 1950s, according to the latest report on climate impacts from the Intergovernmental Panel on Climate Change (IPCC).
But this migration comes with its own risks.
These shifting ranges due to climate change can introduce species to new, unfamiliar stressors – such as shipping lanes or fisheries, says Dr Natalie Posdaljian, a bioacoustician at Scripps Institution of Oceanography in La Jolla, California, who was not involved in the study.
One of these risks is what the researchers describe as a temperature “bait and switch” – where creatures seeking warmer waters can instead be trapped by a sudden cold event. Posdaljian tells Carbon Brief that the new study is the first time that she’s seen evidence of this hazard.
Mass mortality
On 2 March 2021, dead sea creatures started washing up on the south-eastern shores of South Africa between Port Elizabeth and East London. In all, more than 250 individual organisms and 82 separate species were found, including large, migratory species such as manta rays and bull sharks.
In deducing what had happened, the team of researchers examined the temperature data in the days leading up to the event. Using satellite and other observational data, they found that the temperature of the surrounding ocean had dropped by up to 9.2C in less than 24 hours.
The cold event persisted for seven days and had “severe physiological consequences” for the marine organisms there, including hypothermia, malfunction and death, the paper says.
Similar cold shocks have previously occurred in south-eastern South Africa, dating back to at least 1989 and affecting a wide array of creatures, according to the study. But this instance was “probably the biggest cold-water shock [mass mortality event]” ever recorded, Dr Ryan Daly, a marine scientist at the Oceanographic Research Institute in Durban, South Africa, tells Carbon Brief. Daly is one of the authors of the new study.
The influx of cold water was due to a process called “upwelling”, which carries cold, nutrient-rich water from the ocean depths to its surface.
The study identifies three factors that make rapid upwelling events likely to happen: strong currents interacting with the continental shelf, strong winds blowing from the east to the west and meanders in the current. Such winds occur predominantly during the southern hemisphere’s summer, between October and April. They often act as a harbinger of temperature drops occurring in the coming 0-72 hours, the study notes.
All three of these factors are characteristic of both the south-eastern coast of South Africa and the eastern coast of Australia, where strong currents known as the Agulhas and the East Australian Current, respectively, run up against the continental shelf.
‘Trapped’
Dr Camrin Braun, an ocean ecologist at the Woods Hole Oceanographic Institution in Massachusetts, finds it surprising that even large, migratory species such as rays and bull sharks were killed by the cold snap. Braun, who was not involved in the new research, tells Carbon Brief that these animals “can move really far and really fast”.
Daly says that this surprised the research team as well. But it’s possible, he says, that the onset of the cold temperatures was quick enough and large enough that the animals got “trapped” instead of being able to escape.
To underscore this, the researchers use data on bull shark movements and ocean temperatures from tags attached to sharks before, during and after the event.
They find that the sharks consistently demonstrate “attempted avoidance” of lower temperatures – moving closer to the surface while swimming through upwelling areas and only travelling at deeper depths once they reach warmer waters.
The team also observe one shark taking up residence in a sheltered bay during one upwelling event to escape the cold waters. The researchers write that these actions “probably represent behavioural strategies to avoid/survive intense temperature declines”.
On its own, the shark-movement data is “kind of limited” and does not “make a very convincing case”, Braun says. But combining it with other data “really up[s] the ante on the importance” of the research, he adds.
Climate patterns
The researchers also look at several decades’ worth of sea surface temperature and wind data to understand whether these upwelling events are changing in frequency or intensity.
They identify clear increasing trends in the proportion of winds that favour upwelling events across three sites in South Africa. (Previous research has shown a similar increase in such winds in south-eastern Australia.)
Then, for the three South African sites and three Australian sites, they compare temperature data from three locations: “inshore”, defined as between 0-15km from the shore, “midshelf”, which is 15-30km from the shore and “offshore” – located within the warm “core” of the current. The inshore and midshelf locations fall within the upwelling zone, but the offshore ones do not.
If, as they hypothesised, upwelling events were becoming more frequent, the number of cold events inshore would increase over time, while the number of such events offshore would stay the same. Similarly, an upwards trend in the intensity of cold snaps would be revealed in the inshore and midshelf, but not the offshore, data.
The chart below shows that the proportion of upwelling-favourable winds (top left) at three sites in South Africa has been steadily increasing since the “upwelling season” – the period of upwelling-favourable winds stretching from October to April – of 1988-89.
The other three charts show increasing trends in the number of cold events (top right), the average intensity of cold events (bottom left) and the average rate of onset of such cold events (bottom right) for a single site, Port Alfred, over the same period. All three characteristics increase over time for the inshore (blue) and midshelf (pink) locations, but not the offshore (green) one, supporting the idea that the cold snaps are linked to upwelling.
These increases persist over long enough time periods, the authors argue, to be clear evidence of long-term trends, rather than natural variation. Furthermore, the study points to previous research – dating back more than 30 years – that shows evidence of climate change increasing upwelling intensity due in part to increasingly strong winds driven by the land warming faster than the ocean.
This trend analysis is one of the most valuable contributions of the new study, Posdaljian says. She tells Carbon Brief:
“It’s often hard to be able to have that kind of concrete evidence about how something could be increasing in intensity or frequency over time.”
The idea that climate change could lead to an increase in cold snaps may seem counterintuitive. But those increased temperatures “mean more energy in the climate [system] too”, Daly says. He explains:
“This wind-driven upwelling, linked to climate change, is essentially an extreme event – just like we might have more flooding and stronger cyclones and hurricanes.
“If you think about equivalent on land, that might be fires being fuelled by more intense wind. It takes an existing natural phenomenon and basically supercharges that to become [more] intense.”
He adds:
“Going forward, we predict that this is going to become a more regular phenomenon and could impact a lot of different species.”
The researchers “did a really good job of creating this foundational understanding” of how such cold events could hit marine ecosystems in future, Posdaljian says.
Looking ahead, she adds that she would like to see more work focusing on projecting future trends in cold snaps and perhaps even being able to predict them. She tells Carbon Brief:
“A lot of these animals are not just dealing with one stressor from climate change…We can’t necessarily mitigate these [extreme events], but what we can do is maybe reduce the other stressors that we can control.”
The post Climate change ‘bait and switch’ threatens sharks and rays appeared first on Carbon Brief.
Climate Change
FLIP OFF WOODSIDE TO SAVE SCOTT REEF: Greenpeace, Michael Caton, Thinkerbell mobilise Australia to challenge gas project at Scott Reef
6 November 2026
Greenpeace Australia Pacific has joined forces with Thinkerbell and iconic Australian actor Michael Caton on a major public movement and behaviour change initiative to save Scott Reef, calling on Australians to “flip off” gas corporation Woodside. The company plans to drill for gas at Australia’s largest oceanic reef, home to vulnerable green sea turtles, endangered pygmy blue whales, and thousands of marine species, off the coast of Western Australia.
WATCH THE FULL VIDEO HERE
At the heart of the collaboration is somebody who knows a thing or two about fighting off corporations to protect a home: Michael Caton. Set in a courtroom, Caton gives his voice to a voiceless inhabitant, a green sea turtle, and together they invite the public to show their support to save Scott Reef.
Designed to shift public behaviour and drive national debate, the movement asks the public to tag their MPs – applying direct political pressure on Environment Minister Murray Watt and Prime Minister Albanese Albanese to “flip off” Woodside’s dirty gas project, which would see up to 57 toxic wells drilled around Scott Reef off the coast of Western Australia.
Voiced by Michael Caton and set to a soundtrack provided by Radiohead, the narrative centres on our hero turtle defending her home from corporate overreach in a courtroom showdown. As the turtle defiantly flips her flippers at Woodside, Michael Caton calls on everyday Australians to take a stand and help save her home.
Michael Caton said: “I’m proud to lend my voice to Greenpeace to help save Scott Reef. The marine life out there can’t speak up, so we need to. Some things are too precious to risk.”
Glenn Walker, Head of Nature at Greenpeace Australia Pacific, added: “Woodside’s dirty gas project at Scott Reef, Australia’s largest oceanic reef, is an environmental disaster waiting to happen, threatening thousands of species, including the extremely vulnerable green sea turtles that nest there. By literally flipping off Woodside and Big Gas, Aussies are cutting through corporate spin and sending an unignorable message to Environment Minister Murray Watt and the Albanese government: save Scott Reef.”
Adam Ferrier, co-founder of Thinkerbell, said: “You can fight a corporation in the courtroom forever, but the real power to deliver lasting protection rests in parliament. Right now, our MPs hold an extraordinary opportunity to safeguard Scott Reef for generations to come. I’m proudly from WA, and I know how much the natural environment means to the people and economy of Western Australia. I’m also sure Woodside wants to do the right thing, and with enough public support and government action we’ll together save Scott Reef.
Paul Swann, Chief Creative Tinker at Thinkerbell notes: “When the stakes are this high, polite ads don’t work. You need an unignorable provocation that galvanises people and puts the pressure squarely where it belongs, on our leaders in Canberra. This isn’t just about protecting a reef; it’s about holding power to account.”
Greenpeace has been campaigning to stop Woodside’s dirty gas plans for years, increasing pressure on the Australian government to save Scott Reef from becoming an industrialised gas zone. From actions aboard Woodside’s gas platform to cinemas across Australia, Greenpeace isn’t backing off in their advocacy to save Scott Reef.
Rolling out across OOH, digital, social and cinema with an interactive landing page, this project will be amplified by high-profile figures urging Australians to take action, tag their MPs, and defend Scott Reef. The movement combines cinematic storytelling with organic social mobilsation and earned media, planned via Thinkerbell’s Alchemy model to drive real behaviour change and impact.
Marking their first Australian tour in 15 years, English rock band Radiohead will play 16 arena shows across Perth, Melbourne and Sydney in May and June 2027. A $2 donation is included in every ticket price with proceeds going to Greenpeace Australia Pacific and the Australian Marine Conservation Society. Radiohead will match the final amount raised.
ENDS
WATCH NOW:
FOR ASSETS OR MORE INFORMATION, PLEASE CONTACT:
Adam Ferrier | 0413 633 344 | adamferrier@thinkerbell.com
Kimberley Bernard | 0407 581 404 | kbernard@greenpeace.org
ABOUT THINKERBELL
Thinkerbell is a 9-year-old independent creative company. We practise Measured Magic – the coming together of marketing science and hardcore creativity – to help our clients build their brands and change behaviour.
ABOUT GREENPEACE
Greenpeace Australia Pacific is a global independent campaigning organisation that uses peaceful protest and creative confrontation to expose environmental problems and promote solutions that are essential to a green and peaceful future.
Climate Change
Jimmy Barnes, King Gizz lead Aussie music supergroup on new release to save Scott Reef
SYDNEY, Monday 9 November 2026 — Australian music icons Jimmy Barnes AO, King Gizzard & the Lizard Wizard, Fred Leone, Gordi & Montaigne are among the more than 20 Australian artists who have joined forces to release a new song with an urgent message: save Scott Reef.
Released today, “If Not Now” is a reimagining of King Gizzard & the Lizard Wizard’s Environmental Music Prize-winning song “If Not Now, Then When?”, and is a collaboration between Greenpeace Australia Pacific, Green Music Australia, and p(doom) Records.
Scott Reef is a 15-million-year-old ancient coral reef located 270 kilometres off the Kimberley coast of Western Australia. It is Australia’s largest oceanic reef and is home to thousands of marine animals and endangered species, but fossil fuel corporation Woodside plans to drill up to 57 toxic wells under and around the reef, threatening to turn it into an industrial gas zone.
“If Not Now” is the reef’s first and only release, out on all digital platforms and on limited edition 7” vinyl. The song is accompanied by cover art and visualiser from acclaimed Australian artist and ARIA-winning music video director Jonathan Zawada (Flume, The Avalanches).
Speaking about the track, Stu Mackenzie (lead singer, King Gizzard & the Lizard Wizard) said: “Why are we still digging up coal and gas? Why are we allowing this? Why is the Australian government so hell-bent on destroying our beautiful wild and untouched places? I’m proud that a King Gizz song was chosen to represent a growing movement of people who are asking these questions and applying pressure. Let’s shut it down and keep it beautiful.”
Rock legend Jimmy Barnes AO said: “Scott Reef is one of the few pristine reefs left in the world and it happens to be on our doorstep. We’re custodians of it — we’re supposed to be looking after it. It’s ridiculous. We must protect our country and look after what we value most, which is the nature and the beauty of this country.”
Hannah Schuch, Senior Campaigner for Greenpeace Australia Pacific, said: “I’m filled with hope by the incredible musicians and artists who are using their voices and skills to amplify the voices of half a million Australians who are calling on the government to stop Woodside’s nature and climate-wrecking gas plans and save Scott Reef. Australian music has long been a powerful catalyst for change, so saving Scott Reef is a no-brainer for Australian music lovers.”
Contributing artists (in alphabetic order):
- Alex Lahey
- Brinkley Davies (marine biologist/freediver)
- Birdland
- Close Counters
- DOBBY
- Fred Leone (Artist of the Year at the 2026 NIMAs, singing in Butculla)
- Gordi
- John Butler
- Jimmy Barnes
- King Gizzard & the Lizard Wizard
- Leah Senior
- Mahalia Barnes
- Montaigne
- Ngaiire
- NIDALA
- Peppa Lane (Spacey Jane)
- Ruby Rodgers (2026 Environmental Music Prize winner)
- Terry Guyula (Drifting Clouds, singing in Yolgu Matha)
- Tom Mahler (The Moving Stills)
- Urthboy
Production cast:
- Becki Whitton (G Flip, Allday, Stella Donnelly)
- Stu McKenzie (King Gizzard & the Lizard Wizard)
- Tay Blunt (FVNERAL)
- Tim Shiel (Green Music Australia)
Three generations of the Barnes family, Jimmy Barnes, his daughter, Mahalia Barnes and granddaughter Ruby Rodgers, contributed to the track.
The release comes amid growing national pressure on the Federal Government to save Scott Reef from Woodside’s gas drilling plans.
Last week, a leaked letter from WA’s environmental watchdog to Woodside revealed the agency deemed drilling risks to Scott Reef ‘serious, significant and irreversible’, while Greenpeace Australia Pacific activists occupied a major Woodside gas platform, and Perth communities delivered one of the biggest environmental petitions in Australia’s history to Woodside HQ.
The Federal Government is expected to make a decision on Woodside’s Scott Reef drilling plans in the coming months.
-ENDS-
Media contact
To arrange an interview or for more information, contact Emma Sangalli on 0431 513 465 or emma.sangalli@greenpeace.org
High res images and footage of Scott Reef can be found here (NEW) and here.
Jimmy Barnes, King Gizz lead Aussie music supergroup on new release to save Scott Reef
What might a high-school course look like if it helped students understand climate change—and see a place for themselves in responding to it?
Not simply a course about emissions or environmental problems. A course that connects science with the places students know, the decisions their communities face, and the work they might one day do.
Canadian schools already teach climate change and environmental responsibility, including through required curriculum expectations. Ontario’s Grade 9 science course, for example, asks students to assess climate change’s effects on ecosystems and communities, including First Nations, Métis, and Inuit communities. Across Canada, however, the depth and placement of climate learning vary, and opportunities for more specialized study often sit within elective courses.
Part 1 explored how we could build on that foundation through sustained learning from elementary school onward, shaped with First Nations, Inuit, and Métis governments, educators, and education authorities.
One next step worth considering is a required senior-secondary course that brings these threads together. Imagine a course called Climate, Land, and Future Economies: a place to explore climate evidence, community resilience, Indigenous governance, practical solutions, and the possibilities of a changing world.
The idea is not to turn every student into a climate scientist. It is to give every student a stronger foundation for the choices ahead—whether their path leads to university, college, an apprenticeship, employment, entrepreneurship, public service, or work within their own Nation or community.
Start with the science—and make room for questions
A meaningful course would begin with sound science: how the greenhouse effect works, how carbon moves through living systems, how energy choices affect emissions, and how scientists study a changing climate.
But the learning could become more engaging when students have an opportunity to investigate questions close to home.
What can local weather records tell us? How do we distinguish a single unusual season from a longer-term trend? What does a climate projection mean for a community planning its roads, housing, or water systems? What can a dataset tell us—and what remains outside its scope?
These questions invite students into the process of understanding evidence rather than asking them simply to memorize conclusions.
They also create space to discuss uncertainty honestly. Students could explore how researchers reach conclusions, why findings sometimes change, and how to distinguish a legitimate scientific question from a misleading claim.
The aim would be informed curiosity: the confidence to ask good questions, find credible information, and explain what the evidence supports.
Look at climate through the life of a community
Climate learning becomes more meaningful when it moves beyond global averages and into the places people live.
A class might explore a neighbourhood with little shade, a community concerned about flooding, or the choices involved in preparing a school for extreme heat. Students could examine a local emergency plan, speak with community planners, or investigate how housing and transportation decisions affect environmental risk.
The questions soon become as much about people as about climate.
Who has access to a cool, safe place during a heat wave? Who can leave when an evacuation is ordered? What happens when roads, water systems, or food supplies are disrupted? What resources does a community need to prepare?
A course could help students explore how housing, health, income, disability, infrastructure, and access to services shape people’s experiences of environmental change. It could also introduce environmental racism and historic dispossession through carefully researched cases, giving students a way to understand why risks and resources are not always distributed fairly.
That approach would connect climate learning with civic life. Students would begin to see that resilience is not only about stronger buildings or better technology. It is also about relationships, public services, and the ability of communities to care for their members.
Recognize that climate decisions are governance decisions
Consider the questions surrounding a new transmission line, wind project, mine, protected area, or housing development.
Where should it go? Who decides? Whose knowledge informs the decision? Who benefits, and who carries the costs?
These are environmental questions, but they are also questions about governance.
A climate course offers an opportunity to introduce Treaty relationships, Indigenous rights and title, consent, and jurisdiction through specific places and decisions. Rather than presenting these concepts as a single checklist, students could explore the Nations, agreements, histories, and legal frameworks relevant to the case they are studying.
Indigenous governments and communities would enter the discussion as decision-makers with their own laws, responsibilities, and priorities—not only as people affected