Tessa Möller

Photo showing a tall, jagged ice front of the Ronne Ice Shelf in West Antarctica rising above the calm surface of the Weddell Sea. Credit: Torsten Albrecht / PIK.

🔔🚨 New Publication Alert!

Research has shown that the Antarctic Ice Sheet is a climate tipping element.

We found: it’s not one — it’s many.

📄 Paper (open access): www.nature.com/articles/s41...

📢 Press release: www.pik-potsdam.de/en/news/late...

Tread below 🧵👇

Exceeding 1.5 °C requires rethinking accountability in climate policy A scientific foundation is required to establish nations’ responsibilities in a hotter ‘overshoot’ world.

How should climate science and policy respond to a potential exceedance of 1.5°C? We provide our perspective on this in a new @Nature comment 🔗 nature.com/articles/d41586-026-00247-y led by Gaurav Ganti with Sabine Fuss, @joerirogelj.bsky.social, @setupelz.bsky.social & Keywan Riahi 1/

"In regions dominated by small and rapidly responding glaciers, such as [...] the European Alps, over 50% of the glaciers are projected to disappear within the next two decades." New @natclimate.nature.com study by @landervt.bsky.social @harryzeko.bsky.social @hydr-vub.bsky.social

The responsibility of investor-owned carbon majors to contribute to direct air carbon capture and storage investment Carbon dioxide removal (CDR) options are critical for achieving global climate objectives. Yet, many proposed removal technologies are in their formative phase. Significant near-term investments ar...

The world’s largest fossil fuel and cement companies should shoulder a major share of the investment needed to develop carbon removal technologies, according to a new peer-reviewed study in @climate-policy.bsky.social. #carbonmajors #CDR #climatepolicy

Multi-century global and regional sea-level rise commitments from cumulative greenhouse gas emissions in the coming decades - Nature Climate Change It is important to understand how much long-term sea-level rise is already committed due to historical and near-term emissions. Here the authors use a modelling framework to show how decisions on glob...

Really important paper led by my @iiasa.ac.at colleague Alex Nauels www.nature.com/articles/s41...
“The difference between decisive climate action today and continued high emissions is not just measured in degrees of warming but also in meters of sea-level rise” 👏👏👏

NEW – Rapid emissions cuts would avoid 64cm of ‘locked in’ sea level rise by 2300 | @ayeshatandon.carbonbrief.org w/ comment from Dr Catia Domingues

Read here: buff.ly/Ny3nIaT

New research shows that near-term mitigation could spare future generations around 0.6 meters of sea-level rise caused by emissions between 2020 and 2090, making today’s decisions critical not only for limiting warming but also for coastal impacts.

🔗 iiasa.ac.at/news/oct-202...

OUT NOW: Global Tipping Points Report 2025
global-tipping-points.org

Our chapter on the "Implications of overshooting 1.5°C for
Earth system tipping points" is based on an associated paper: doi.org/10.31223/X52...

Minimizing climate overshoot is essential to prevent climate tipping points.

Overshoot: Exploring the implications of meeting 1.5C climate goal ‘from above’ - Carbon Brief The first-ever international conference on the contentious topic of “overshoot” was held last week in...

Super comprehensive report on our @iiasa.ac.at overshoot conference by @carbonbrief.org. Great summary and overview on some of the central discussion points. Check it out👇👇👇
www.carbonbrief.org/overshoot-ex...

First ever international conference on climate overshoot at IIASA As global temperatures approach the 1.5°C threshold, understanding the risks of climate overshoot has become an urgent scientific and policy challenge. From 30 September to 2 October 2025, IIASA will ...

Starting today: 🌍 First international conference on #ClimateOvershoot at #IIASAVienna!

📅 30 Sep–2 Oct
📍Laxenburg, Austria 🇦🇹

As we edge closer to the 1.5 °C limit, understanding the implications for mitigation, adaptation limits and climate justice has never been more urgent.
@iiasa.ac.at

New starter pack with @ipcc.bsky.social #AR7 scientists (bureau, authors, REs)! Full list: apps.ipcc.ch/report/autho...
For SR cities scientists see separate starter pack!
@dianaurge.bsky.social @sherilee.bsky.social @siir-kilkis.bsky.social @janfuglestvedt.bsky.social
go.bsky.app/2FuXb3Y

A prudent planetary limit for geologic carbon storage - Nature A risk-based, spatially explicit analysis of carbon storage in sedimentary basins establishes a prudent planetary limit of around 1,460 Gt of geological carbon storage, which requires making explicit ...

Our paper is out today in @nature.com where we assess a Prudent Planetary Limit for Geologic Carbon Storage:

www.nature.com/articles/s41...

🔥 Just published! 🔥
Our new manuscript on global #wildfires look beyond burned areas and ask:
What drives the #economic damages of wildfires — now & in the future?
We find that socioeconomic vulnerability, not just #climate, is key.
📄 iopscience.iop.org/article/10.1...
(Highlights below ⬇️)

*** Faktencheck***
In der Generaldebatte im Bundestag sprach Bundeskanzler Friedrich #Merz auch zum Klimaschutz. Er sagte:
"Selbst wenn wir alle morgen klimaneutral wären, würde keine einzige Naturkatastrophe weniger geschehen". Ein Faktencheck.
1/

Causal pathway from AMOC to Southern Amazon rainforest indicates stabilising interaction between two climate tipping elements - IOPscience Causal pathway from AMOC to Southern Amazon rainforest indicates stabilising interaction between two climate tipping elements, Högner, Annika, Di Capua, Giorgia, Donges, Jonathan F, Donner, Reik V, Feulner, Georg, Wunderling, Nico

New study out, in which we detect a causal link in reanalysis+observational data from an AMOC SST index to the Southern Amazon rainforest: dry season precipitation increases when the AMOC weakens.

doi.org/10.1088/1748...

Call for abstracts – now open! As the world edges closer to surpassing the 1.5°C global warming threshold, it's time to confront the risks of climate overshoot.
Join leading scientists at the first-ever Overshoot Conference, hosted by IIASA. iiasa.ac.at/events/sep-2... @carlschleussner.bsky.social

This is not the actual cover of Nature, just shown here for illustrative purposes. We did submit this figure for consideration for their cover. Print run in two weeks, we'll know by then if it gets used.

Out today in Nature, our paper on the drivers of the record 2023 summer heating of the North Atlantic. Temperatures warmed to record levels in just a few months. The impacts on climate & ecosystems were severe. A thread on how this work came about and what we found.👇👇🧵 www.nature.com/articles/s41...

German court has established that energy companies can be held liable for climate change damages.

Given those damages are in the 10s of trillions of USD, this is potentially a massive deal. Huge liabilities for historic polluters as more cases get established.

Irreversible glacier change and trough water for centuries after overshooting 1.5 °C - Nature Climate Change How mountain glaciers will react to temporarily overshooting 1.5 °C of warming is poorly understood. Here the authors show irreversible global glacier loss for centuries after overshoot, implying long...

🏔️🌍🌎🌏 New study warns: Even if we only temporarily exceed 1.5 °C, mountain glaciers face irreversible losses lasting centuries. Such an overshoot reduces glacier runoff, specifically in regions where some glaciers regrow.

Further interested? Check out our new publication: doi.org/10.1038/s415...

Incredible new study of annual mass change for EACH world's glacier from 1976 to 2024! 🧊😲💪

Since 1976, glaciers have lost 9179 Gt of water
= 25.3 mm MSL rise! 🌊
41 % (10 mm) occurred in the last decade
6 % (1.5 mm) occurred in the single record year 2023! 🔥

essd.copernicus.org/articles/17/...

New study on linking wealth-based emissions to climate impacts: We find that 2/3 of global warming is attributable to the wealthiest 10% and so are climate extremes.
Article: www.nature.com/articles/s41...
@iiasa.ac.at, @usyseth.bsky.social
1/

Very excited to announce that the call for abstracts for our @iiasa.ac.at overshoot conference is out.

Join us to explore the eightfold path to manage climate risks of an overshoot world:
overshootconference.org
Abstract deadline: June 27.

Congrats to @yilinghwong.bsky.social ! 🥳

Klimaforscher Carl-Friedrich Schleussner im Gespräch: Koalitionsvertrag ignoriert Klimawandel und hat gravierende Lücken im Klimaschutz Klima ist Gegenstand des Koalitionsvertrags zwischen CDU und SPD, Klimaschutz weniger. Was fehlt? Der Klimaforscher Car-Friedrich Schleussner erklärt, wo es Lücken und Widersprüche gibt.

CCS für Gaskraftwerke: ein Irrweg. Kernfusion für #Klimaschutz: ein Ablenkungsmanöver. Technologieoffenheit: eine Floskel, um Altes unter neuem Label zu verkaufen. @carlschleussner.bsky.social spart im Interview @faznet.bsky.social nicht an Kritik am Koalitionsvertrag.

www.faz.net/aktuell/wiss...

Mal kurz von den Livetickern aufgeblickt: das @iiasa.ac.at hat eine neue Studie rausgehauen, die sich mit #GenderEquality & #Klimaresilienz beschäftigt. Demnach könne eine Gleichstellung der Geschlechter die Fähigkeit einer Gesellschaft, mit dem #Klimawandel umzugehen, verbessern. bit.ly/3CMg1Gh 👈

Have we already breached the 1.5°C global warming target? Although the climate goals set by the Paris Agreement are based on the long-term average temperature, one year of high temperatures might be a sign that the 1.5°C threshold has already been reached

Great coverage of our recent study on 2024 warming and the 1.5°C limit by @tinymaddie.bsky.social
here:
www.newscientist.com/article/2467...
@bevacquae.bsky.social

ByTheTime YouTube video by Science Moms

Guess what - our Science Moms climate ad made this top ten best (upcoming) Super Bowl ads list! The only nonprofit ad on the list!

Warning: do not watch without a tissue

www.nytimes.com/2025/02/07/a...

A year above 1.5 °C signals that Earth is most probably within the 20-year period that will reach the Paris Agreement limit - Nature Climate Change What a first year with temperature 1.5 °C above the pre-industrial baseline implies for long-term temperature goals is unclear. Here the authors show that such a first year above the baseline is highl...

In Nature Climate Change, we show that a year above 1.5 °C signals that Earth is most probably within the 20-year period that will reach the Paris Agreement limit. @natclimchange.bsky.social

Have you ever wondered if the global leadership on climate would be less depressing if we had more Luisas and fewer Elons? With gender equality backsliding everywhere, it’s super important to stress its role in addressing the climate crisis. A 🧵 on our new paper on gender equality & scenarios: