"I anticipated that our work would be questioned, but only because its implications were politically inconvenient. I never expected that science itself would come under attack."
Powerful statements from the brilliant scientist and communicator @drkatemarvel.bsky.social
grist.org/science/kate...
Die Länder, die Klimaschutz früh umsetzen, sind besonders gut gegen externe Schocks gewappnet. Die explodierenden Benzinpreise sind ein starkes Argument, Innovation und den Ausbau der erneuerbaren Energien rasch voranzutreiben – egal, was andere tun.
www.watson.ch/schweiz/inte...
But the fact that the energy imbalance is changing so rapidly and that we cannot fully explain it, is worrying. If anything, future warming estimates are likely to be revised upward. 12/n
In unpublished paper, we show that the current EEI trends point to substantially higher warming that estimated so far. Arguments for a net positive feedback causing a runaway (Venus type) effect are unsupported. 11/n
... b) the separation of forcing and feedback remains hard, c) the patterns of warming in the Pacific also differ between models and observations (“pattern effect”).10/n
The good: climate models largely replicate these cloud SW effects. So yes, the feedbacks do point towards higher warming, but nothing completely unexpected. The worrying: a) the clear sky SW part remains to be explained, climate models do not show a total EEI trend as pronounced as observed, ... 9/n
Paolo Ceppi argue that the SW cloud part is largely human induced, through higher SSTs and CO2 leading to a warmer atm., decreased rel. hum., and less clouds. Lower aerosols due to stricter shipping fuel regulations reducing cloud cond. also contribute. 8/n
www.carbonbrief.org/guest-post-h...
Changes in clouds have been documented from satellite before, but the satellite record is short (grey line in figure) and interannual variability is large. And so far, it was largely unclear how much was forced vs. unforced (i.e. variability). 7/n
EEI however has increased by a factor 2-3 in just 2 decades, which is massive. And it’s *not* due to more CO2, which would reduce outgoing longwave (LW) radiation. It’s shortwave (SW). Candidates include changes in scattering (reduced air pollution), surface albedo (snow, ice), and cloud cover. 6/n
Surface warming has accelerated in recent decades, with 2023/2024 breaking records. We largely understand 2023/2024, and the acceleration is well documented, as we showed here. 4/n
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
We’ve been tracking surface temperature for over a century, but over 90% of the energy ends up in the ocean. Only a small fraction remains in the atmosphere. Surface temperature is a good proxy for most impacts (which is why the Paris agreement uses it), but EEI tracks the total heat content. 3/n
For the first time, the “State of the Climate” report includes the Earth Energy Imbalance (EEI) as an indicator. The EEI is fundamentaL: if it’s positive, then the Earth is absorbing more energy than it’s releasing to space and therefore must warm. 2/n
wmo.int/publication-...
The last 11 years were the hottest on record, which is unsurprising and worrying at the same time, because we don’t fully understand why.
Thread... 1/n
Als direkte Demokratie braucht die Schweiz vielfältige & unabhängige Medien. Über 600 Professor:innen aus allen Sprachregionen & Disziplinen setzen sich deshalb ein für einen starken Service public und sagen «Nein» zur Halbierungsinitiative.
➡️ www.wissenschaft-fuer-den-service-public.ch
Nicht ganz. Verzicht wäre durchaus eine Lösung, wenn die Menschen das wollen, aber sie wollen mehrheitlich nicht...
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...
Snapshot of US EPA's "causes of climate change" webpage as of 12/8/2025. Human causes are no longer mentioned anywhere on the page.
It appears that the U.S. Environmental Protection Agency (EPA) has, within the past week, scrubbed a large amount of climate change content from its official website, as well as *removed human-caused warming* from the discussion on its "causes of climate change" page.
Der Nebelspalter Faktencheck übersieht relevante Punkte, zieht die falschen Schlüsse und differenziert nicht zwischen Technologie und Politik. Meine Replik:
www.nebelspalter.ch/themen/2025/...
What are the mechanisms that generate precipitation? What is the relationship between extreme weather events and climate change? Watch Climate Extremes: Extreme Weather to learn from leading scientists such as @retoknutti.bsky.social! youtube.com/watch?v=X6VC... #extremeweather #climatechange
"What used to be basically impossible 20 years ago has become almost mainstream these days". Watch Climate Extremes: Extreme Weather to learn about climate change and extreme weather from leading scientists such as @retoknutti.bsky.social! youtube.com/watch?v=X6VC...
#extremeweather #climatechange
Jede Tonne CO2 richtet Schaden an, der Verursacher zahlt jedoch nicht. Aber was würde die Tonne CO2 denn kosten, und würde das das Problem lösen? 💰💵
greencircle.ch/de/energie/e...
Time series showing growing Earth energy imbalance (greater heating) this century
Earth's energy imbalance needs to decline to stabilise global temperatures but it is growing
The doubling of the rate of global heating in recent decades has surprised the scientific community so needs to be better understood yet our capability to measure Earth's energy imbalance is at risk: doi.org/10.1029/2024...
Next Tuesday evening, we are delighted to have one of the most remarkable and inspiring scientists as our guest. If you've never heard Naomi Oreskes @naomioreskes.bsky.social (Harvard University) in person, this is your chance at ETH Zürich as part of the SPEED2ZERO Perspective series.
The US brain drain.
Cutting science, innovation and education is an incredibly short-sighted strategy. The loss in competitiveness, innovation, leadership and economic value to society is large, long-lasting and almost certainly exceeds the short-term savings by far.
www.nature.com/articles/d41...
What a project! A group students talking to climate scientists. It was a pleasure to be part of this and share my views on climate and the role of scientific information in society.
Open access.
link.springer.com/book/10.1007...
Wir verlieren in der Schweiz beim Klimaschutz den Anschluss, obwohl wir alle Voraussetzungen dazu hätten und es sich langfristig lohnen würde.
Interview auf Ringier Green Circle:
greencircle.ch/de/natur/kli...
Today, a broad coalition of scientific professional societies who represent over 92,000 scientists are speaking out against the politicization and demonization of Federally funded science and government scientist jobs.
It was an honor to help the Union of Concerned Scientists with this! 🧪🌎
Powerful words from the American Geophysical Union.
Stand Up for Science protests are happening Friday, March 7th in over 30 US cities.
standupforscience2025.org
