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Posts by Prof. Stefan Rahmstorf

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Opinion: The AMOC is weakening – time to take the evidence seriously Abstract. The Atlantic Meridional Overturning Circulation (AMOC) is a critical component of the climate system. Climate models have long predicted a slowing of the AMOC due to anthropogenic forcing, w...

We have a new preprint out for open review at Ocean Science, which discusses the evidence for the #AMOC already slowing. 🌊
If you have any comments, counter-arguments, or things we may have missed - please post them there! (Or here.)
Thanks!
egusphere.copernicus.org/preprints/20...

1 hour ago 43 18 0 1
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Neue Studie: Nordische Meeresströmung wird stärker, während sich AMOC abschwächt 20.04.2026 – Eine stärker werdende Strömung vom Atlantik in das Nordmeer (NOC) könnte eine direkte Folge der Abschwächung der Atlantischen Meriodionalen Umwälzströmung (AMOC) sein, und keine davon una...

Bedeutet ein stabiler oder zunehmender Ein- und Ausstrom vom Atlantik ins Nordmeer, dass die #AMOC stabil ist, wie manche argumentieren? 🌊
Nein. Das Gegenteil ist richtig:
www.pik-potsdam.de/de/aktuelles...

10 hours ago 156 65 3 2
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Nordic Seas Overturning Circulation strengthens as Atlantic Meridional Overturning Circulation weakens, new study 20/04/2026 –A new modelling study identifies a feedback mechanism suggesting that a strengthening of the Nordic Seas Overturning Circulation (NOC) could be a direct consequence of the Atlantic Meridio...

Does a stable or increasing water exchange between the Atlantic and the Nordic Seas mean the #AMOC is stable, as some have argued? 🌊
Nope. The opposite is the case.
www.pik-potsdam.de/en/news/late...

1 day ago 125 54 0 0
Video

Volcanoes emit CO₂, but the amount is small compared to human emissions from fossil fuels, explains PIK scientist @rahmstorf.bsky.social in new video addressing climate change myths. Each year, human activities release 50-100 times more CO₂ from fossil fuels than global volcanic emissions.

1 day ago 64 28 2 0
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Nordic overturning increases as AMOC weakens in response to global warming Abstract. The Atlantic Meridional Overturning Circulation (AMOC) is weakening in response to global warming, while the Nordic Seas Overturning Circulation (NOC) is projected to strengthen. So far, the...

Breaking: our new study just published shows that a stable or strengthening ocean current into the Nordic Seas is not a sign of a stable Atlantic overturning #AMOC. On the contrary, it is a physically expected result of an AMOC weakening. 🌊
Open access: os.copernicus.org/articles/22/...

1 day ago 168 60 0 6
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THREAD: The IEA global energy review 2026

* CO2 record high, but growth nearly ground to halt
* Clean energy shaved 3bn tonnes off CO2
* Fossil-fuel power pushed into reverse
* Age of Electricity "confirmed"
* "Extraordinary" solar growth
* Batteries up 40%
* EVs up 20%
1/10

1 day ago 1103 491 13 58

"When I started writing about the climate crisis in the 1980s I was in my twenties, and I didn’t fully comprehend that there could be a force on this planet so steeped in greed & power that it would sacrifice the earth & its inhabitants for its own narrow interests. But there is, and it’s Big Oil."

1 day ago 302 117 3 1

With Trump you know with everything he says that more likely than not, the opposite is true.

2 days ago 228 40 7 1
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Menschenfeindliche Verkehrspolitik: Nicht nur ein Unfall, sondern unterlassene Hilfeleistung Ein elfjähriger Junge wird in Hamburg beim Radfahren von einem Lkw-Fahrer getötet. Sein Tod zeigt, wie gefährlich die Straßen für Kinder sind.

Als Vater zweier Kinder kenne ich diese Gefühle allzu gut. Beim Lesen kamen mir die Tränen.
Nicht nur ein Verkehrsunfall, sondern unterlassene Hilfeleistung
von Kersten Augustin
www.taz.de/!6168170

2 days ago 421 144 17 10
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Zehntausende protestieren für rasche Energiewende Bundesweit haben Zehntausende Menschen für eine schnellere Energiewende demonstriert. Der Bundesregierung warfen sie vor, die falschen Ziele zu verfolgen. Im Zentrum der Kritik: Wirtschaftsministerin ...

www.tagesschau.de/inland/gesel...

2 days ago 829 221 15 7

Zitat aus dem Artikel.

2 days ago 2 0 1 0
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„Näher am Kipppunkt“: Atlantikströmung AMOC schwächt sich stärker ab als gedacht – mit verheerenden Folgen Die atlantische Umwälzzirkulation AMOC verliert deutlich mehr an Kraft als bisher angenommen. Wissenschaftler warnen vor dramatischen Folgen.

Ein "wissenschaftliches Alarmsignal": die neue Studie der französischen Kollegen zur Atlantikströmung #AMOC. 🌊
Hört es jemand? 😨
www.fr.de/wissen/atlan...

3 days ago 1559 826 65 52
Demo: Erneuerbare Energien verteidigen am 18.04.2026

Demo: Erneuerbare Energien verteidigen am 18.04.2026

Trotz fataler Abhängigkeit von Erdöl und Erdgas plant die Regierung Angriffe auf #Energiewende und #erneuerbare Energien. Das gefährdet Wohlstand und Demokratie. , 12 Uhr: Stoppschild in #Hamburg #Berlin #München #Köln.

4 days ago 337 108 8 2
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A vital system of Atlantic Ocean currents is weakening and closer to collapse than thought, new studies find | CNN New research provides alarming evidence this ocean circulation is slowing and could be heading toward a shutdown, which would have catastrophic impacts on the planet’s weather and climate.

New study: most climate models underestimate the decline of the Atlantic overturning circulation #AMOC. The AMOC is on course to slow by more than 50% by the end of the century. 🌊
Very likely the AMOC will then be past the tipping point for full shutdown. 😨
us.cnn.com/2026/04/16/c...

4 days ago 469 269 12 30
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Critical Atlantic current significantly more likely to collapse than thought Scientists say finding is ‘very concerning’ as collapse would be catastrophic for Europe, Africa and the Americas

Guardian article on the new paper: www.theguardian.com/environment/...

5 days ago 193 80 4 6
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Shutdown of northern Atlantic overturning after 2100 following deep mixing collapse in CMIP6 projections Shutdown of northern Atlantic overturning after 2100 following deep mixing collapse in CMIP6 projections, Drijfhout, Sybren, Angevaare, Joran R, Mecking, Jennifer, van Westen, René M, Rahmstorf, Stefan

The #AMOC by 2100 will thus be so weak (~8 Sv) that it is very likely on the way to full shutdown, as our study last year showed: iopscience.iop.org/article/10.1...
In my view, this now makes a full #AMOC shutdown more likely than not. Definitely not a low likelihood risk, as we used to think.

5 days ago 222 110 10 8
Science | AAAS

Breaking: New study using observational constraints projects that the Atlantic Ocean circulation #AMOC will weaken ~50% by 2100, even for medium emissions and without Greenland melting. 🌊
More realistic models means stronger weakening - not entirely unexpected.
www.science.org/doi/10.1126/...

5 days ago 434 288 9 45
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Event | ENERGIETAGE 2026

Energiekrise? Was nun?
Ab Mittwoch gibt es wieder die Berliner Energietage Online!
Eröffnung um 9 Uhr mit Brigitte Knopf, Felix Matthes, Pauline Sophie Heinrich, Jürgen Pöschk und mir.
Info und Anmeldung (gratis) ⬇️
www.energietage.de/event/d254-e...

1 week ago 77 25 2 0
Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation - Nature Climate Change Cooling has been observed over the past century in the northern Atlantic, and this study presents multiple lines of evidence that suggest it may be a result of a reduction in the Atlantic meridional overturning circulation. The decrease in this circulation, particularly after 1970, seems to be unprecedented in the past millennium and melt from the Greenland Ice Sheet may be a contributing factor.

Our original 2015 paper is this: www.nature.com/articles/ncl...
And an accessible introduction to the Atlantic overturning circulation known as #AMOC for non-experts can be read here:
tos.org/oceanography...

1 week ago 68 14 2 0
Atlantic exceptionalism in the twentieth century - Nature Climate Change The North Atlantic is exceptional in cooling during the twentieth century while the world warmed. Here we look back on an influential 2015 study that linked this cooling to a weakening of the Atlantic Meridional Overturning Circulation and consider the wider implications that this may have for climate, ecosystems and society.

The journal Nature Climate Change is celebrating its 15th birthday by looking back at highlights from this time. I'm honored that our 2015 paper "Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation" is the first in the series 🌊:
www.nature.com/articles/s41...

1 week ago 152 29 2 1

Yes and that study does not predict where the tipping point is. Neither can I. It's a risk assessment issue, not a prediction issue.

1 week ago 11 1 1 0
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Multi‐Stability of the Present‐Day Atlantic Meridional Overturning Circulation There is much supporting evidence (freshwater export, paleo records, model hierarchy) that the present-day AMOC is in a multi-stable regime.

Would you like to know more about the #AMOC risk? Here is a recent peer-reviewed, open-access review paper by 22 AMOC experts:

wires.onlinelibrary.wiley.com/doi/10.1002/...

1 week ago 118 43 3 4
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Meridionally consistent decline in the observed western boundary contribution to the Atlantic Meridional Overturning Circulation Western boundary observations in the Atlantic suggest a meridionally consistent decline in the ocean overturning circulation.

New study finds the "canary in the coal mine" for the #AMOC: a consistent decline of the western overturning circulation, down from 20 to 15 Sv during 2004-2023 at 26° N. 🌊
AMOC "could be at or near a critical tipping point, potentially leading to its collapse".
www.science.org/doi/10.1126/...

1 week ago 541 312 26 31
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Key ocean current is slowing at locations around the Atlantic Measurements by buoys at four latitudes in the western Atlantic provide the strongest evidence yet that the Atlantic Meridional Overturning Circulation is weakening

Measurements by buoys at four latitudes in the western Atlantic provide the strongest evidence yet that the Atlantic Meridional Overturning Circulation is weakening

1 week ago 73 40 1 7
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The White House budget request for fiscal 2027 calls for $3.4 billion in cuts to NASA’s science budget — a nearly 50 percent reduction — and the termination of 40 missions.

1 week ago 121 37 4 0
Stefan Rahmstorf Q&A: The Atlantic Ocean tipping point
Stefan Rahmstorf Q&A: The Atlantic Ocean tipping point YouTube video by Earth System Analysis - Potsdam Institute

Thanks! I’ll check it out.
And this: 🌊 Rahmstorf Q&A on YouTube: youtu.be/RvZOU7aKjDM

3 weeks ago 36 9 0 1
Geld verdienen mit E-Auto und bidirektionalem Laden
Geld verdienen mit E-Auto und bidirektionalem Laden YouTube video by erneuerbare tv

Was bringt bidirektionales Laden? Für Auto-Besitzer und ebenso für Nicht-Besitzer, die gelegentlich eins mieten?
Holland macht es vor, und dieses Video erklärt wie es geht!
youtu.be/1W6-mThc8_k?...

1 week ago 267 103 9 10
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RealClimate: Spencer’s Shenanigans: Part II RealClimate: We previously highlighted Roy Spencer's poor practices in comparing models with observations, but we've now dug down a little deeper, and it's not pretty. A few weeks ago, the email excha...

If you see one of the diagrams on the internet that supposedly disprove #globalwarming or climate models, they invariably are aimed at lay people and don’t hold up under scrutiny. 🧐
Here’s another example (a cherry 🍒 pick) by notorious Roy Spencer debunked.
www.realclimate.org/index.php/ar...

2 weeks ago 128 33 3 2
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Unsere Atmosphäre ist dünn wie eine Zwiebelschale - KlimaLounge Die Lufthülle unserer Erde schützt uns vor der eisigen Kälte und aggressiven Strahlung des Weltalls. Sie versorgt uns nicht nur mit der Luft zum Atmen,

Die #Artemis Astronauten können es sehen: unsere Atmosphäre ist dünn wie eine Zwiebelschale. Ein hauchdünner fragiler Gasschleier, der uns vor der eisigen Kälte und Strahlung des Weltalls schützt. Nur ein Millionstel der Masse unseres Heimatplaneten.
scilogs.spektrum.de/klimalounge/...

2 weeks ago 300 85 7 4
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Sieben auf einen Streich Am einfachsten würde in der Iran-Krise eine Geschwindigkeitsbegrenzung den Spritverbrauch senken. Die Kolumne Öko-logisch.

Sieben Vorteile auf einen Streich!
Wer möchte sie nicht?
Von Rainer Grießhammer
www.fr.de/politik/trot...

3 weeks ago 208 69 14 2