‘Een verregaande uitfasering van fossiele brandstoffen is de meest economisch efficiënte strategie.’ www.mo.be/nieuws/europ...

In December 2025, Arctic sea-ice extent reached a record low - a substantial decline from the previous record low in 2024.

Happy New Year from AGU! Thank you for being a part of our global community. #AGU #NYE #NewYears #science

As always, my last post of the year reminder... Reducing emissions will reduce future climate warming and impacts. The time is now. Visualization made by globalcarbonbudget.org. Thanks for being here in 2025! I appreciate all the support 🙂

Looking back to @wwattribution.bsky.social studies in 2025 showed again, in stark terms, how unfairly the consequences of human-induced climate change are distributed. The world does not have to be like this, we have a lot of agency to make it better. www.worldweatherattribution.org/unequal-evid...

Wetterextreme nehmen durch die #Erderhitzung stark zu. Das zeigen nicht nur die Daten der weltweiten Wetterstationen, sondern auch die Analyse einzelner Ereignisse durch das World Weather Attribution Projekt. Erderhitzung macht Welt gefährlicher von Jonas Waack www.taz.de/!6141769

A quick look back at 2025 regarding the instability risk of the Atlantic Ocean circulation #AMOC.🌊 Some bad, some positive news. A meta-analysis of 768 simulations with 38 different climate models shows an #AMOC shutdown is not a low-probability event any more. 1/6 iopscience.iop.org/article/10.1...

"The bill for extreme weather damages will continue to rise until the world slashes greenhouse gas emissions and phases out fossil fuels." What some don't understand: it will rise disproportionately as resilience limits of infrastructure are increasingly exceeded. www.theguardian.com/world/2025/d...

Where the world’s electricity comes from. Looking forward to the update including 2025.

Perpetual reminder: extreme rainfall events increase due to #globalheating. Weather station data show what has been predicted for over 30 years by climate scientists. These extremes are now far outside the historical climate. Study: www.nature.com/articles/s41...

Trotz Clickbait-Überschrift ein informativer Artikel. (Es geht aber nicht etwa um eine Vorhersage für diesen Winter!) www.t-online.de/nachrichten/...

That’s a wrap: #HappyHolidays from PIK. Thank you for all your support throughout the year! We look forward to sharing more exciting research with you in 2026. The photo shows details of a frozen pond in Potsdam, captured by PIK scientist Stefan @rahmstorf.bsky.social.

Guter Tag um an @hateaid.org zu spenden, habe das auch gerade schnell erledigt. hateaid.org

Astonishing feat! US will break its record for the warmest Christmas by ~5°F! That’s remarkable. Anomalies are up to +40°F in the nation’s middle and as you can see the US has the warmest air - relative to average - in the World! H/T to @BenNollWeather

Some consider the lack of weakening of the currents between Atlantic and Nordic Seas an argument against an ongoing #AMOC weakening. Here we show why the opposite is true: AMOC weakening causes a temporary increase in Nordic Seas overturning. 🌊 egusphere.copernicus.org/preprints/20...

So the US administration considers hate speech and disinformation “American viewpoints“? 🙄 HateAid is an organization that also helps climate scientists to defend themselves against online abuse and threats. Its founder was awarded the Order of Merit of the Federal Republic of Germany 🇩🇪 this year.

"Trump has long hated wind, now one of the cheapest forms of new electricity. Over the years he has claimed that it is expensive (false), causes cancer (false), ruins the environment (false), harms whales (false)." thebulletin.org/2025/12/trum...

It’s so laughable that it could be a satire from The Onion. Unfortunately it seems to be deadly serious. The US administration tries to destroy real climate science and to replace it with the fossil fuel lobby’s view.

Chris Piecuch shows how the rate of sea-level rise along the US coast has doubled since 1900, from 2 cm to 4 cm per decade. It has risen by 40 cm by now. Here he briefly explains this (and how the DOE claimed the opposite) at the AGU25 meeting last week. www.youtube.com/watch?v=fI0K...

Michael Mann and Bob Ward don't mince their words here, and unfortunately they are right about the Trump administration's "Soviet-style campaign to prevent Americans and the rest of the world from knowing the truth about climate change." www.theguardian.com/commentisfre...

Have you also asked an AI chatbot about climate and found the answer to be quite good? Maybe that is because it was you who asked. Some AI (e.g. Grok) tailors their response to suit your beliefs. It’s called ‘AI sycophancy’ (a new word I just learned.) globalwitness.org/en/campaigns...

Unterwegs in Blatten. Ein Portrait über mich, die Liebe zu den Bergen, den Umgang mit Risiken, und die Überzeugung, dass positive Narrative, Lösungen und ein politischer Rahmen zwingend sind. www.3sat.de/wissen/scien...

What is the global ocean overturning circulation, and why does it matter for you? Here’s a great short explainer by the Australian Centre for Excellence in Antarctic Science. Did you know a slowing ocean overturning circulation could also affect your life? antarctic.org.au/new-aceas-ex...

116 climate Katharines on Bluesky alone! That’s a reminder of a fact few lay people realize: there’s tens of thousands of climate scientists, with all kinds of backgrounds. That over 99% agree on human-caused global warming means something: that the evidence for it is beyond reasonable doubt.

🌊 What is the Meridional Overturning Circulation and why is it important? The Meridional Overturning Circulation (#MOC) – critical for transporting heat, carbon, oxygen and nutrients across the globe – is weakening under climate change.

The weakening of the atlantic meridional overturning circulation (AMOC - potentially causing cooler winters in Europe as often explained by @rahmstorf.bsky.social) is only part of the even faster weakening of global ocean circulation that could harm nutrients transport to the sea surface #Antarcic 🧪

Ein sehr schöner sehenswerter Film von @ingwarpero.bsky.social zeigt an wunderbaren Beispielen, wie eine kluge Verkehrspolitik die Lebensqualität in unseren Städten rasch und drastisch verbessern kann! Die Reise geht von Paris über Gent, Utrecht und weitere bis Kopenhagen. youtu.be/R5jQc1jXLAU?...

Plausible worst-case climate futures and extreme events for the UK Paper by Arnell et al.: agupubs.onlinelibrary.wiley.com/doi/10.1029/... Article: www.theguardian.com/environment/...

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Anteil E-Autos an den 2024 verkauften Autos: Norwegen 🇳🇴 92% Schweden 🇸🇪 58% Dänemark 🇩🇰 56% Finland 🇫🇮 50% Niederlande 🇳🇱 48% China 🇨🇳 48% In diesem Jahr sicher noch mehr.

What would you prefer as your legacy: 3 meters sea-level rise or #AMOC shutdown? For me the answer is neither. Let's get out of fossil fuels fast enough to minimise both of these very real risks. www.newscientist.com/article/2504...

„Die Welt“ verbreitet erneut eine bizarre Verschwörungserzählung: das ausdrückliche politische Ziel von PIK-Direktor Johan Rockström und mir sei „die Überwindung des Wirtschaftswachstums“. Sorry, leider falsch. Mehr zu Axel Bojanowski im Thread bei X: x.com/rahmstorf/st...

AGU has a Congressional email and call script up on NCAR:

The Trump regime wants to dismantle a world leading climate research center. Why? Because the US has become a petrostate where the government has been captured by fossil fuel interests. They’re calling climate science “green new scam research”, in full denial of reality. 🤯

A recent study by Dutch colleagues shows that a shutdown of the Atlantic overturning circulation #AMOC could bring extreme drought to Europe for centuries. That is a thus far underappreciated risk of climate change. @swinda.bsky.social www.yahoo.com/news/article...

If someone tells you the CO2 is coming out of the sea, they try to fool you. We know exactly where it comes from and where it goes. We emit CO2, about half of that stays in the atmosphere, and a quarter each is taken up by oceans and forests. Measured facts! globalcarbonbudget.org/gcb-2025/

Collapse of key Atlantic current could bring extreme drought to Europe for centuries, study finds. @swinda.bsky.social That's an under-appreciated impact of #AMOC shutdown, of particular concern given the recent results showing much higher likelihood of this. 1/2 www.livescience.com/planet-earth...

Great podcast explaining to Americans how “balcony solar” took off in Europe, with millions in Germany 🇩🇪 alone now harvesting solar power with these panels that you just take home and plug in, and they pay back their price within a few years.

Read it and weep:

Ganz Deutschland rätselt: Was ist ein “hocheffizienter Verbrenner”? Hier werden Physik, Ökonomie und politische Psychologie gut erklärt: heinerm.substack.com/p/hocheffizi...

Iceland is right to consider this an existential threat. www.dagens.com/news/iceland...

A sub-field of science looks at whether the Atlantic ocean circulation #AMOC has weakened. Direct measurements suggest yes but only started in 2004. So people look at temperature and salinity data. A new study finds a robust slowdown fingerprint at 1000–2000 m depth. www.nature.com/articles/s43...

In der Tat eine interessante Frage: Wie beeinflusst der Klimawandel unsere persönlichen Beziehungen? Wie ist das bei euch? Das Private ist klimapolitisch von Bernhard Pötter www.taz.de/!6133075

Giving in to authoritarianism rather than sticking up for free speech. What has become of the BBC?

It should be obvious by now that we cannot make the future of human civilisation dependent on whether the fossil fuel vendors vote for ending fossil fuel use. Rather, it is up to those who buy fossil fuels to end their lethal addiction fast, before it is too late.

📢 New paper on the impacts of AMOC collapse on European hydroclimate. 🌊 We find an AMOC collapse would exacerbate drought conditions across Europe, linked to reduced precipitation. In combination with climate change droughts are expected to become more frequent and severe. doi.org/10.5194/hess...

When a government speaks responsibly about climate risks. Iceland's climate minister Jóhannsson: "We believe that confronting climate tipping points and the risks they pose openly is not a sign of 'pessimism' or 'alarmism' but a sign of realism and responsibility." youtu.be/B-0eQnEEsYA?...

“… because ignoring systemic risk is unacceptable!” Iceland’s climate minister in Belém on the risk of major #AMOC changes. “Prevention remains our first duty.” Listen to him (and my talk 🌊) here: youtu.be/B-0eQnEEsYA?... The first 2 mins show how the live stream was ended by a 🔥.

Many people think about cold in Northern Europe if the Atlantic Ocean current system #AMOC fails. But that wouldn’t be the only problem for Europe by far. This new study shows that severe drought is another one. 🌊