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Major reversal in ocean circulation detected in the Southern Ocean

https://www.icm.csic.es/en/news/major-reversal-ocean-circulation-detected-southern-ocean-key-climate-implications
276•riffraff•3h ago•142 comments

WASM Agents: AI agents running in the browser

https://blog.mozilla.ai/wasm-agents-ai-agents-running-in-your-browser/
96•selvan•3h ago•17 comments

The Rise of Whatever

https://eev.ee/blog/2025/07/03/the-rise-of-whatever/
283•cratermoon•3h ago•193 comments

Introducing tmux-rs

https://richardscollin.github.io/tmux-rs/
728•Jtsummers•17h ago•229 comments

Zig breaking change – initial Writergate

https://github.com/ziglang/zig/pull/24329
77•Retro_Dev•4h ago•55 comments

How AI on Microcontrollers Actually Works: Operators and Kernels

https://danielmangum.com/posts/ai-microcontrollers-operators-kernels/
31•hasheddan•3d ago•0 comments

Flounder Mode – Kevin Kelly on a different way to do great work

https://joincolossus.com/article/flounder-mode/
231•latentnumber•17h ago•48 comments

LooksMapping

https://looksmapping.com/
36•elsewhen•4h ago•15 comments

Raphael Discovery Emerges from Vatican Museum Restoration

https://news.artnet.com/art-world/raphael-rooms-restoration-discovery-2662624
12•andsoitis•2d ago•1 comments

When Your Exit Strategy Dream Is My Customer Nightmare

https://my-notes.dragas.net/2025/07/04/your-exit-strategy-dream-is-my-customer-nightmare/
6•edent•1h ago•1 comments

Launch HN: K-Scale Labs (YC W24) – Open-Source Humanoid Robots

181•codekansas•15h ago•85 comments

AV1@Scale: Film Grain Synthesis, The Awakening

https://netflixtechblog.com/av1-scale-film-grain-synthesis-the-awakening-ee09cfdff40b
202•CharlesW•15h ago•162 comments

One Billion Cells – Another Multiplayer Demo with Clojure

https://cells.andersmurphy.com/
9•adityaathalye•2h ago•1 comments

Wind Knitting Factory

https://www.merelkarhof.nl/work/wind-knitting-factory
121•bschne•12h ago•31 comments

Context Engineering for Agents

https://rlancemartin.github.io/2025/06/23/context_engineering/
38•0x79de•2d ago•8 comments

Alternative Blanket Implementations for a Single Rust Trait

https://www.greyblake.com/blog/alternative-blanket-implementations-for-single-rust-trait/
7•greyblake•3d ago•0 comments

My open source project was relicensed by a YC company [license updated]

https://twitter.com/soham_btw/status/1940952786491027886
431•sohzm•6h ago•163 comments

Peasant Railgun

https://knightsdigest.com/what-exactly-is-the-peasant-railgun-in-dd-5e/
239•cainxinth•18h ago•166 comments

Poor Man's Back End-as-a-Service (BaaS), Similar to Firebase/Supabase/Pocketbase

https://github.com/zserge/pennybase
172•dcu•16h ago•106 comments

High-Fidelity Simultaneous Speech-to-Speech Translation

https://arxiv.org/abs/2502.03382
87•Bluestein•12h ago•44 comments

Manipulating trapped air bubbles in ice for message storage in cold regions

https://www.cell.com/cell-reports-physical-science/fulltext/S2666-3864(25)00221-8
53•__rito__•3d ago•13 comments

Ubuntu 25.10 Raises RISC-V Profile Requirements

https://www.omgubuntu.co.uk/2025/06/ubuntu-riscv-rva23-support
100•bundie•3d ago•27 comments

As a Labrador swam by me out to sea his owner said I hope he doesn't meet a seal

https://www.irishtimes.com/opinion/an-irish-diary/2025/07/03/all-at-sea-with-a-lockdown-labrador/
9•austinallegro•51m ago•0 comments

Where is my von Braun wheel?

https://angadh.com/wherevonbraunwheel
153•speckx•18h ago•107 comments

The US dollar is on track for its worst year in modern history

https://www.semafor.com/article/07/03/2025/the-us-dollar-is-on-track-for-its-worst-year-in-modern-history
70•harambae•1h ago•57 comments

Caching is an abstraction, not an optimization

https://buttondown.com/jaffray/archive/caching-is-an-abstraction-not-an-optimization/
109•samuel246•2d ago•91 comments

Opening up ‘Zero-Knowledge Proof’ technology

https://blog.google/technology/safety-security/opening-up-zero-knowledge-proof-technology-to-promote-privacy-in-age-assurance/
276•doomroot13•14h ago•169 comments

CO2 sequestration through accelerated weathering of limestone on ships

https://www.science.org/doi/10.1126/sciadv.adr7250
56•PaulHoule•9h ago•47 comments

Converge (YC S23) well-capitalized New York startup seeks product developers

https://www.runconverge.com/careers
1•thomashlvt•11h ago

Postcard is now open source

https://www.contraption.co/postcard-open-source/
105•philip1209•15h ago•31 comments
Open in hackernews

Major reversal in ocean circulation detected in the Southern Ocean

https://www.icm.csic.es/en/news/major-reversal-ocean-circulation-detected-southern-ocean-key-climate-implications
275•riffraff•3h ago

Comments

scottgg•3h ago
> In the long term, this process could double current atmospheric CO₂ concentrations by releasing carbon that has been stored in the deep ocean for centuries—potentially with catastrophic consequences for the global climate.

Well, fuck

troyvit•3h ago
Yah I came here for some good news. Whoops.
kergonath•3h ago
You should probably avoid any article about climate, then. Good news is scarce these days.
ykonstant•2h ago
Good news everyone! We have a delivery to the new beachside resort at Mt Washington!
jes5199•2h ago
i’d really prefer a timeline more specific than “in the long term”
integricho•3h ago
It does not sound like a subtle signal or warning about crossing a threshold, more like a we are already past the point of no return and now we can just sit back and watch as the apocalypse unfolds, first row seats for all recent generations.
delusional•3h ago
Climate advocates in general try to avoid implying that we've already crossed a threshold, as that breeds hopelessness.

They want decisive and ambitious action, you can't get that if we all turn to doomerism.

anon-3988•3h ago
For me its very clear that something will happen given that we fundamentally will never give up our lifestyle. I am not even talking about the ultra rich lifestyle, but lets say the bottom 70% of the world's population.
thanhhaimai•2h ago
I think you overestimate how rich the bottom 70% of the world is.

The bottom 70% of the world's population would have less than $X00 in the bank, and wouldn't have much control over their lifestyle.

smt88•2h ago
We don't need to give up our lifestyle. We could switch to renewables, which would create jobs and save money in the process.

The reasons we haven't done this are because China and India are hungrily industrializing, and the Republican Party in the US is captured by fossil fuel companies.

chneu•20m ago
Stop blaming China and India. They're an easy excuse.

And yes, we do need to give up several aspects of our lifestyles. Meat consumption absolutely must come down. Air travel must come down. Disposable goods, and consumer plastics, must come down. Our lifestyles must change. Capitalism encourages status symbol goods such as beef, travel/tourism, excessive consumption goods, etc.

We need widespread consumer behavioral change before we have any hope of governments listening to people. As long as half of the population doesn't care about the climate then nothing meaningful will get done. For real change to happen people need sunk cost. Right now people have far too many excuses and denials to actually do much. There is always a China to blame, or a company to blame, or a mega rich person to blame.

integricho•3h ago
That sould be the least we do, some sort of coordinated global action to slow down, stop, eventually recover? The damage, and yet not a single country is willing to do anything serious in that regard. Politicians are exclusively focused on their political career, not thinking about the greater benefit to Earth, life, the human civilization. Pretty hopeless how things stand right now.
panstromek•2h ago
> The damage, and yet not a single country is willing to do anything serious in that regard.

This just doesn't correspond to reality. A lot of serious stuff is happening in this space.

kadoban•3h ago
> Climate advocates in general try to avoid implying that we've already crossed a threshold, as that breeds hopelessness.

None of that means it's not true.

Who is left to take decisive and ambitious action in say, the next decade?

colordrops•3h ago
It's a bad idea, the best way to deal with problems is to face them directly, no matter how desperate. This is a similar failure to COVID where they thought lying to the public would make for better outcomes but ended up sowing distrust. In the case of climate change this sows complacency.
taxicabjesus•2h ago
> This is a similar failure to COVID where they thought lying to the public would make for better outcomes

I'm curious which lies you're referring to. "Two Weeks to Flatten the Curve" reminded me of the time I had fun with my passenger's ignorance of celestial mechanics. She thought the moon really was done for, but after a few more minutes had passed it started to come back: https://news.ycombinator.com/item?id=24881670

> but ended up sowing distrust.

Because most people eventually caught on that they were being lied to?

jes5199•2h ago
okay then why is it taboo to suggest geoengineering interventions like injecting sulfer into the upper atmosphere? The climate advocates don’t have any decisive and ambitious actions that they actually are willing to try.
not_kurt_godel•2h ago
They are, Biden funded research into it in 2022 https://www.cnbc.com/2022/10/13/what-is-solar-geoengineering.... Biden being the same POTUS who proposed and signed IRA aka the 'Green New Deal'.

Now that we've established that, what's your decisive and ambitious action you've made towards addressing climate change, so we can learn from the example you've set?

shironandon•2h ago
David Suzuki had some real talk yesterday:

https://www.ipolitics.ca/2025/07/02/its-too-late-david-suzuk...

We are now in the "hunker down" phase of global warming.

signalToNose•2h ago
The five stages of grief, often referred to as the Kübler-Ross model, are: denial, anger, bargaining, depression, and acceptance.
chneu•15m ago
Be aware this isn't really what mental health teaches anymore.
atoav•2h ago
Yes sure. But as someone who was a kid in the 90s all my life I learned about how climate change is the biggest challenge to humanity. Yet all my life I have seen grown adults pretend it doesn't exist, and when that was no longer avoidable they pretended is was natural and when that was no longer defendable... You get the idea. And I grew up in a part of the world where you could see the glaciers melting with your own eyes.

The doom of climate change is mostly people to dumb to understand the most basic of models or (worse) unwilling to do so on ideological grounds. I already decided not to have children in my life because I think it is irresponsible to put them into this world. We will have enough climate migration anyways.

The truth is that there are tripping points that are extremely hard to reverse and may or may not trigger other tripping points. Reading these risks as a reason not to care is the opposite of what should happen.

And then you figure out what the real reason is to burn the world: some rich fucks trying to extract a few thousand dollars per second more f4om the r3st of us.

vaylian•2h ago
Some things are set in motion. But it's not clear if we have reached a state yet, where climate change will reinforce itself indefinitely.

Staying below 1.5 degrees global warming is very unlikely at this point. But every tenth of a degree counts. Humanity needs to be decisive in slowing down climate change. This is a matter of political will.

gjadi•2h ago
Two things: slowdown and adaptation. Slow CO2 emissions because every tons make it worse for +10 000yrs. Adaptation, because infrastructures changes are slow to do and the sooner we start the sooner we can absorb damage.
whatever1•3h ago
That is the sh* that happens when we move the system too far away from its previous equilibrium. It might settle to a drastically different one that will decimate huge proportions of population.
SlowTao•2h ago
The example I use is this. Falling of a building is harmless, standing on the ground is harmless. It is the transition that matters.

I'm sure we can survive fairly reasonably in whatever climate we end up with in a few hundred/thousand years, but the gap in between is a really doozy. The stories and myths about the selfish people of our times will go on for millennia.

It is the book series 'Carbon Ideologies' by William T Volleman, the opening few pages are written to those that read them in a few hundred years. Those that read these today are already convinced, those in the future will want answers. All he does is use examples of how we live to point out that we are not inherently evil, just looking out for our more immediate needs.

hnarn•17m ago
> The stories and myths about the selfish people of our times will go on for millennia.

Except there is nothing inherently more selfish about ”people” today than at any point in history.

If anything, it might change humanity’s view of itself, and its capability to collectively handle major threats.

cyberlimerence•3h ago
Next up, AMOC collapse.
SlowTao•1h ago
There was a report that said the AMOC could collapse between 2025 and 2075. That said the 2025 mark was said to be very unlikely, I hope it still is...
topato•3h ago
Did it actually say it will DOUBLE the CO2 concentration? Definitely past the point of no return. I guess us millennials WILL actually see the worst climate change outcomes WELL within our lifetimes...
trhway•2h ago
In my home town back in Russia they now easily grow the stuff of my unreachable back then in USSR childhood dreams - apricots, cherries (the large sweet ones). The children there though don't do backcountry skiing like i did 40+ years ago because there is no snow these years there. And Russia pumps out fossil fuels without any care. They feel that things like opening of the Northern Passage and more agriculture on the previously hardly suitable lands are great for their future (they aren't climate change deniers, they are believers. Like everybody else there, I was taught about climate change as a clearly established scientific fact in the 6th grade in 1985).

So, until somebody brings out 10+ aircraft carriers and enforces global climate accord, i don't see any progress happening here.

ndsipa_pomu•1h ago
I see the major problem isn't that there will be just warmer temperatures, but that the climate will become unpredictably changeable. For the moment, it can be beneficial for agriculture in some areas, but it's likely that our global food production will have to massively change to take into account times of drought and flooding that will destroy crops in some areas. Whereas now we can just grow crops in fields, we may have to grow food in greenhouses just to be able to provide the plants with consistent growing conditions.
bbarnett•9m ago
There are a lot of variables here, and one is the sun. The other is time.

We can certainly, even without genetic engineering breed crops more suited for shorter growing time frames.

There are a lot of corn hybrids, some mature fast, others far slower. Some require more sun, others less. For example, some of the faster growing varieties only take 60 days to mature, others 100+. But here's the thing. Those are 60 "good weather" days. As in not too much cloud, not too unseasonably cold or warm, reasonable amounts of rain and water, and so on.

As corn takes time to grow and mature, it doesn't matter how much sun you throw at it, it still only grows so fast. Up North, even if it's warmer, you still need enough sun too. Compressing the sun around the summer solstice doesn't help. Giving it 22 hour long days of sun doesn't just magically make the corn grow 2x as fast as an area with 11 hours of usable sun.

And the spring is still "rainy season". Some crops can't take too much rain.

I guess my point is, Northern areas will require only certain crops. That's fine of course, and it will indeed feed people, but some crops won't be on the table.

One thing that may have already helped Russia, is the extensive work the Soviets put into breeding crops to grow further north:

https://solar.lowtechmagazine.com/2020/04/fruit-trenches-cul...

While I do not doubt the weather is more mild in Russia these days, it's also quite erratic. At least it is here in Canada. Some winters mild, then bam a winter of "old". So I wonder if the above breeds have given Russia a leg up on taking advantage?

Ringz•1h ago
> So, until somebody brings out 10+ aircraft carriers and enforces global climate accord, i don't see any progress happening here.

If we look at the enforcement and outcomes of former climate action „plans“ this is unfortunately a valid option.

panstromek•2h ago
The keyword here is "Long term" I suppose, that can mean anything. I couldn't actually find where this claim comes from. The referenced paper doesn't seem to say anything about doubling CO2 concetrations.
SwtCyber•1h ago
Still serious, but yeah, the headline might be running ahead of the data a bit
bertili•44m ago
If it "Short Term" becomes obvious that we are past the point of no return it doesn't really matter if "Long Term" units is 100 or 1000 years. Most future living things will be suffering. There could have been more future things than past things to enjoy this beautiful planet.
taylorlapeyre•2h ago
The deep-ocean vent south of Antarctica is real but small, on the order of a few-tenths Pg C yr⁻¹. The claim that it could double atmospheric CO₂ exaggerates the flux by three orders of magnitude relative to observed values and known physical limits.

The most optimistic estimate of deep-water outgassing south of 60 ° S is 0.36 Pg C yr⁻¹. Even if that rate tripled and persisted unabated, it would take more than 800 years to add 895 Pg C (which would be what it would require to justify the press release’s claims of “doubling”)

What the salinity reversal can do is:

- Expose ice shelves to warmer subsurface water, accelerating sea-level rise.

- Reduce the Southern Ocean’s role as a sink by a few tenths Pg C yr⁻¹, nudging the global ocean sink (~2.7 Pg C yr⁻¹) downward.

- Perturb atmospheric circulation patterns, with knock-on effects for the Atlantic overturning (but those links remain speculative).

ImaCake•2h ago
Thanks for the clarification, these click-bait titles pop up again and again around very interesting technical climate science, causing not only pointless panic but allowing denialists to drive doubt by pointing out the BS.

Its doubly frustrating because these studies invariably indicate that climate change is happening, getting worse, and triggering feedback loops that amplify CO2.

eastbound•2h ago
It is true. My personal test is to ask climate believers what the wage gap is. If they answer women earn .77 cents on the dollar -> Not science.

If I really witness New York flooded to the 3rd floor in my life, it’s really sad, because no-one told me [who didn’t also make spurious science on other topics of life].

bryanrasmussen•1h ago
Your personal test for someone making a technical claim on one matter is to ask them a technical question on another thing that they have not claimed any expertise in. If they guess and guess wrong you ignore their claims on the thing they supposedly know something about because.. points I guess.

Hey, I do a lot of crazy stuff myself, so not exactly blaming you but I don't think your "flooding == really sad" claim holds up here, because of the crazy.

vixen99•1h ago
I won't put words in your mouth but given what you say - doesn't this imply calamity? So how do we explain why Net Zero is essentially collapsing? Why do a number of countries say one thing and do another? There's certainly no consensus that survival is at stake.
cedilla•3m ago
Isn't a bit premature to jump to "it's BS" just because one random commenter on some forum says it's wrong?

Journalists make lots of mistake, and it's good to keep that in mind, but random people in forums are even worse.

mturmon•2h ago
I read TFA and looked over the PNAS article (https://www.pnas.org/doi/10.1073/pnas.2500440122) it is based on.

I believe the deep-ocean vents you mention are beside the point. The article is discussing the upwelling of cold, CO2-rich water in the Southern Ocean - not emissions from vents.

Also, it’s worth noting that the PNAS article does not mention CO2 per se, only upwelling. The article summary of the press release does draw the CO2 connection.

Besides the connections you mention, the PNAS article points out that this result illustrates that current models of ice/ocean interaction are not producing these observational trends.

flanked-evergl•2h ago
It said "in the long term it could" not will. Which in scientific parlance means absolutely nothing, but in climate science parlance means that they know where their bread is butter.
dao-•2h ago
In climate science parlance it means it's a conservative guess and will likely happen faster than anticipated.
michaelhoney•1h ago
are you seriously asserting that climate scientists are in it for the money?
lynx97•18m ago
Are any serious scientists giving away their work for free?
globular-toast•2h ago
It's fine... Gen Alpha will figure it out by asking AI.
zamalek•2h ago
> Definitely past the point of no return.

We don't really know at what point that is. It's probably something we can only identify in hindsight. I find it bewildering that our approach is basically FAFO.

SwtCyber•1h ago
The timeline isn't some far-off sci-fi scenario anymore. Millennials and Gen Z are basically the frontline generations
chneu•42m ago
We've been past the point of no return since the mid-90s.
csomar•3h ago
Can someone explain in simple terms what this means? Like what is happening (like am 5) and what are the consequences of this.
Workaccount2•3h ago
The consequences of the reversal of the current or the consequences of CO2 in the atmosphere doubling?
notfed•2h ago
Yes
ashoeafoot•3h ago
You get unreliable weather patterns . monsoon in dry places, and monsoon dependent countries falling dry..

And thus unreliable investment, a house or factory might be flood prone in a dessert valley, a dam with power stations might fail to provide.

So you have uninsureable riches, that might aswell no longer be there.

signalToNose•2h ago
And as a consequence, massive migration from inhabitable regions. Hard to imagine the implication when there are billions of people affected
Tokkemon•3h ago
Gotta blow the dust off that Day After Tomorrow DVD.
leke•3h ago
To borrow a comment from YouTube

> The Day After Tomorrow was a documentary.

nandomrumber•2h ago
I’ve got two Samsung DVD-M105 players here, brand new, still in box original, never been opened, dispatched from wholesaler in September 2001 if you want to enhance the experience.
lovich•2h ago
I have a non zero desire to take you up on that
dottjt•2h ago
what's so special about that model?
SlowTao•2h ago
I'm guessing nothing in particular other than being period correct hardware. Would want to check if the power capacitors are still in good shape.
mkagenius•2h ago
Full bridge rectifier as well
dzhiurgis•1h ago
What happens to them?
SwtCyber•1h ago
Climate fiction's starting to feel more like a documentary with a bad CGI budget
whitehexagon•57m ago
Another heatwave here last week, and I somehow found myself watching that DVD. It as aged quite well, but I found it annoying that they spent half the movie burning books to keep warm, and yet are sourounded by wooden furniture.

On that topic, the book series including 'Fifty Degrees Below' by Kim Stanley Robinson is worth a read. I think I got that reading tip from HN, or maybe it was his Mars triology, which also has some nice planetary science stuff.

CalRobert•38m ago
Perhaps it was an attempt at symbolism
arethuza•25m ago
I recommend KSR's The Ministry for the Future
ainiriand•48m ago
We've been here in Valencia (Spain) over 30C since early June: https://www.timeanddate.com/weather/spain/valencia/historic?...

It is absolutely not normal.

walthamstow•11m ago
In London it has barely rained since the start of May, after the sunniest and warmest spring on record. Obviously as an Englishman that sounds pretty great to me but it is not typical at all.

https://www.metoffice.gov.uk/about-us/news-and-media/media-c...

zelphirkalt•1m ago
Close to where I live they declared the dryest year in more than 100 years, as it rains so rarely.
anvandare•2h ago
And to Man was said: "Because you did not listen to wisdom and disobeyed that which was commanded to you 'You must work and keep it', "cursed are the sea and the earth because of you; no matter painful toil you will eat food from it no more. When you work the ground, it will no longer yield its crops for you. You will be a restless wanderer on the earth."

  - Phthora 3:12
flanked-evergl•2h ago
You really think this is on the cards? Like really? Food production has increased without fail, and has become more efficient. Most of the west can afford to mitigate any risks, most of Africa has less infrastructure each year than they had the previous year because of a lack of maintenance and sometimes active sabotage, so they don't really even have that much that can be destroyed by weather. I would be super surprised if anything even slightly in line with this happened in the next century.

And another thing is, it's very clear that the people who are willing to disrupt society for the sake of "climate justice" actually sees the abolition of the west and free markets as a higher priority than reducing Co2 emissions, as we already have perfectly good solutions to that: nuclear. But they don't want a solution to the climate problem, they want the west to fall.

throwawayqqq11•2h ago
You sound very delusional, so many points in your text to be corrected but i dont think its worth it.

Just one nasty question: if you, as an assumed conservative, had to choose between conserving capitalism or the environment, what would it be?

robk•2h ago
Why does anyone bother to respond to a throwaway?
SlowTao•1h ago
Not OP you are responding to but someone made a great point.

Conservatives will design a society were they assume they are at the top. More left leaning people will design a society with no concept of where they will be in it.

throwawayqqq11•1h ago
This sounds wrong. Hierarchies are inevitable because there will always be differences among individuals. Leftists will design a society where these hierarchies will not be that astronomically high, to raise the bottom ceiling.

Or do you know any popular left leaning politician that advocates for full blown communism instead of just tax reform?

What you called a good point isnt, its diffamation of the left. And btw, imo full blown communism is equally delusional as busines-as-usual capitalism.

ndsipa_pomu•1h ago
Alternatively, right-wingers work to elevate the minority at the top and left-wingers seek to raise the standards of those at the bottom.
vixen99•1h ago
Instead of cheap rhetoric, a few 'corrections' would have been more to the point. This isn't the MailOnline comments section.
throwawayqqq11•29m ago
> they want the west to fall.

Then go ahead, why dont you correct him :-)

I had too many meandering, unfruitful conversations with such people where i was way too polite. At some point you have to call it by its name: pathological idiocy.

saubeidl•12m ago
Climate will disrupt society if we don't act.

People are proposing comparatively minor fixes to avoid unmitigated disaster.

moffkalast•40m ago
Religious quotes are like astrology, horoscopes vague and generic enough to apply to just about anyone and anything at any point in time.
climb_stealth•26m ago
Man, this really hits differently in the context of this topic :/
UberFly•2h ago
I'll bet that while measuring CO₂, the BEC and the ICM-CSIC will verify that the SMOC and the AMOC in the North Atlantic is not just weakening, but has reversed. This would be an interesting discovery. Truly.
ars•2h ago
If this is the very first time this part of the ocean has ever been imaged/studied, how do we know that this is unusual and not something that happens periodically?
bronco21016•1h ago
Exactly the same thought I had while reading the article. They mention multiple times this is the first time ever that they’ve been able to measure anything in this area. My take on science is that we need to measure for some period of time before we jump to conclusions about the normal state of affairs.

This isn’t to argue against climate change, but I think journalism like this only fuels skeptics.

abhijat•2h ago
The article says that deep water is warmer, afaik deep water is colder and surface water is hotter (https://en.wikipedia.org/wiki/Upwelling)?

A 2023 study https://www.sciencedaily.com/releases/2023/03/230330102327.h... observed slowdown in Antarctic overturning, in which cold water sinks down at the south pole and then spreads north in the deeper parts of the ocean.

The slowing of this process would cause deep ocean water to become warmer.

edit: the publication linked in the article https://www.pnas.org/doi/epub/10.1073/pnas.2500440122 makes this a bit clearer:

"In the polar Southern Ocean, cold, fresh surface waters overlay warmer, saltier deep waters (Fig. 2A). During winter, surface cooling and sea ice formation reduce stratification, allowing vertical mixing to transport heat upward, either melting sea ice from below or limiting its growth (8). However, decades of surface freshening strengthened stratification, trapping subsurface heat at depth, sustaining expanded sea ice coverage (7, 9) and limiting deep convection along with open-ocean polynyas (10). Here, we show that since 2015, these conditions have reversed: Surface salinity in the polar Southern Ocean has increased, upper-ocean stratification has weakened, sea ice has reached multiple record lows, and open-ocean polynyas have reemerged."

jteg6886•2h ago
Also this link explains the warmer deep water:

https://en.m.wikipedia.org/wiki/Circumpolar_deep_water

user070223•1h ago
In general at high enough depth the ocean temperature is constant[0]. At high latitude like the southern ocean it's constant at whatever depth. I think the surface ambient temperature is below(cooler) the temperature where the water density is the highest around 4 degrees for pure water(water has negative thermal expansion which causes it to expand and float!), for southern ocean salinity is between 33-34 and maximum density is below 0[1] but still ambient might be lower which means the colder water is lighter.

https://en.wikipedia.org/wiki/File:ThermoclineSeasonDepth.pn...

https://en.wikipedia.org/wiki/File:T-S_diagram.pdf

SwtCyber•1h ago
That trapped warmth doesn't mean the deep water is "hot" in an absolute sense, just that it's saltier and denser and relatively warmer than the surface
Modified3019•39m ago
I’m reminded of how small changes in temperature can greatly effect the metabolism of things like crabs: https://www.globalseafood.org/advocate/noaa-confirms-link-be...
IAmGraydon•2h ago
Be warned, this article is misleading. The actual scientific paper shows a salinity‑driven weakening of stratification that likely allows more subsurface heat to reach the surface and melt sea ice. The article describes this as a complete overturning‑circulation reversal with dire carbon release consequences. These are claims that the paper itself does not make or substantiate. The paper actually does not use the words carbon or CO2 even once. The authors of the article took such liberties with this that I really believe this should be considered disinformation.
robk•2h ago
It doesn't reflect their existing views so many will pile on with glee sadly.
panstromek•1h ago
Glad I'm not the only one to see the disconnect here. I thought I'm somehow missing rest of the paper text, it really doesn't say all that much compared to the article interpretation.
ffwd•1h ago
No, the new algorithms used to be determine this was created by ICM-CSIC who are also the publishers of this article.

Also the authors of the paper is involved with the article, there is for example this quote:

“We are witnessing a true reversal of ocean circulation in the Southern Hemisphere—something we’ve never seen before,” explains Antonio Turiel, ICM-CSIC researcher and co-author of the study.

zmmmmm•53m ago
The article is about the overall findings and their implications, not just the specific paper istelf. Scientists will always be conservative in what they publish, scoping it down to the minimum interpretation that is supported by their evidence. The article directly interviews authors of the study and quotes them, eg:

> We are witnessing a true reversal of ocean circulation in the Southern Hemisphere—something we’ve never seen before,” explains Antonio Turiel, ICM-CSIC researcher and co-author of the study.

If you incorporate these statements it seems quite reasonable to me. You can argue with the author of the study saying that but I can't see an issue with an article reporting that they did, if that's what actually happened.

dofubej•45m ago
This was published on the website of the CSIC, which is an arm of scientific propaganda of the socialist government of Spain. I would not give it any credibility.
anilakar•2h ago
> surface water is being replaced by deep water masses rising to the surface, bringing with them heat and carbon dioxide (CO₂) that had been trapped for centuries.

True or not, this will be yet another asset in the the climate change deniers' toolbox.

rob_c•2h ago
Omg it's a headline just like that movie...

Please let's not repeat 2020 with the flu again.

SwtCyber•1h ago
If deep water is now rising and releasing centuries of stored CO2, we're talking about a major shift in Earth's climate plumbing. Also wild that this only became visible thanks to a novel satellite processor
ninetyninenine•1h ago
I'm not getting an EV because it's already done. The worst consequences of our actions cannot be stopped.
Ringz•1h ago
Most climate research studies provide a range from optimistic to pessimistic outlooks on climate impacts. It would be interesting to know how the studies from the last 30 years have fared. I have the feeling that rather the pessimistic estimates have come to pass.
exe34•1h ago
https://www.scientificamerican.com/article/climate-science-p...

https://www.vice.com/en/article/the-uns-devastating-climate-...

Old articles. Nowadays I'd say there's an even stronger current against "doomerism", which acts as a force suppressing sufficiently bad news. Don't look up!

n2fole00•1h ago
I didn't know much about the Southern Ocean. For a quick update, YouTube has some good info https://www.youtube.com/watch?v=8VMSF28J9H4
nokeya•1h ago
Aren’t we, by the historical earth standards, in the multi-millennia ice age right now? And this ice age is coming to its end. And this is perfectly ok for the planet, it doesn’t give a single fck about us mere humans.
lopis•58m ago
Of course the climate is ok for the planet. The planet is a huge rock. What on Earth is your point?
nokeya•52m ago
My point is we have to adapt, whether we like it or not.
chneu•40m ago
And the other point is we shouldn't have to adapt as fast as we're having to.

We still don't have to. We could change our consumption in a few years and still avoid a lot of this. But we won't

verisimi•52m ago
I think the point would be if the climate changes radically on the planet regardless of humans, why do we think these changes are driven by humanity? Perhaps the point is also what is bad about the warming that is being measured? Ie, if change is inevitable, warming rather than cooling could be more beneficial.
nokeya•46m ago
Thank you for explaining my thoughts clearer than I was able to do. Exactly.
kadoban•55m ago
> And this is perfectly ok for the planet, it doesn’t give a single fck about us mere humans

It's not great for us humans though, pretty sure most people care about that more than the planet being happy or unhappy.

moffkalast•43m ago
https://xkcd.com/1732/
marcyb5st•34m ago
The problem is that it is not ok for every other animal and plant sharing the planet with us. The climate is changing at never seen rates apart from the aftermath of asteroid impacts, mega eruptions, and other such events.

It is so fast in fact, that animals especially don't/won't have the number of generations necessary to make natural selection make them evolve in the right ways to survive a warmer Earth.

Finally, it might not be Ok as the planet could become uninhabitable. For example, given enough CO2/other greenhouse gasses the air becomes warmer to a level where it can hold enough water vapor (a more powerful greenhouse gas than CO2) that the planet could enter a spiral where it get's warmer, warmer air can hold more water vapor, which makes everything warmer, ... until you get to something that is closer to Venus with its super high greenhouse gasses and hot atmosphere.

lancewiggs•46m ago
Look at London. Draw a line west. Compare climates. Now do the same for New York and go East. Ocean currents are what keeps London warm and NYC cool.

So this is a huge deal. I’ve been down to the Southern Ocean, lectured all the way by scientists.

North of the Antarctic is the only place on earth where the sea can rotate completely around the world without hitting a land mass, and it is deemed the engine of the world’s oceans. Those oceans are what have absorbed most of the excess CO2 that we’ve emitted, and a lot captured has been buried in deep ocean. But the ocean warms, and can capture less CO2, and bad days are ahead.

This news signals not just a slowing in that absorption for an area, which not just sends more CO2 into the atmosphere, but has more terrifyingly unknown downstream implications for other ocean streams.

moffkalast•44m ago
We thought the currents would run AMOC but got a SMOCdown instead?

Well as long as we keep pretending that the most conservative of the already downplayed IPCC estimates is the real trajectory we'll keep getting surprised over and over. It's not really a coincidence that most climate scientists are depressed.

saubeidl•14m ago
In related news:

* Data centers powering artificial intelligence could use more electricity than entire cities [0]

* Google’s emissions up 51% as AI electricity demand derails efforts to go green [1]

* AI is poised to drive 160% increase in data center power demand [2]

It is a doomsday cult in the most literal sense.

[0] https://www.cnbc.com/2024/11/23/data-centers-powering-ai-cou...

[1] https://www.theguardian.com/technology/2025/jun/27/google-em...

[2] https://www.goldmansachs.com/insights/articles/AI-poised-to-...

dottjt•2m ago
Not that I necessarily believe it, but isn't the rationale that technology allows us to scale without the need for additional humans? A bit in the same way that oil provides us many multiples of manpower?

So for example, if AI can replace the need for additional humans, then overall we're using net less energy?