Carl Schleussner
@carlschleussner.bsky.social
Climate Scientist at @iiasa.ac.at and Humboldt Universität zu Berlin Views are my own.
Reposted by Carl Schleussner
2025 was again a severe #hurricane season with 4 major hurricanes (3 cat 5 hurricanes).
In terms of accumulated cyclone energy (ACE) it was slightly above a normal season.
Seasonal forecasts (including ours 🥳) predicted the ACE well this year 💪
In terms of accumulated cyclone energy (ACE) it was slightly above a normal season.
Seasonal forecasts (including ours 🥳) predicted the ACE well this year 💪
November 20, 2025 at 9:49 PM
2025 was again a severe #hurricane season with 4 major hurricanes (3 cat 5 hurricanes).
In terms of accumulated cyclone energy (ACE) it was slightly above a normal season.
Seasonal forecasts (including ours 🥳) predicted the ACE well this year 💪
In terms of accumulated cyclone energy (ACE) it was slightly above a normal season.
Seasonal forecasts (including ours 🥳) predicted the ACE well this year 💪
Reposted by Carl Schleussner
Against the backdrop of negotiations at #COP30, leading climate scientists have released the Búzios Scientific Statement, offering a clear assessment of the world’s remaining options to return to 1.5°C of warming by the end of the century.
🔗 iiasa.ac.at/news/nov-202...
🔗 iiasa.ac.at/news/nov-202...
November 17, 2025 at 3:35 PM
Against the backdrop of negotiations at #COP30, leading climate scientists have released the Búzios Scientific Statement, offering a clear assessment of the world’s remaining options to return to 1.5°C of warming by the end of the century.
🔗 iiasa.ac.at/news/nov-202...
🔗 iiasa.ac.at/news/nov-202...
Reposted by Carl Schleussner
Búzios Scientific Statement
100 climate researchers, coordinated by @pik-potsdam.bsky.social & @iiasa.ac.at, released a joint statement to inform the #COP30 negotiations and provide guidance on difficult but doable global efforts designed to limit dangerous overshoot of 1.5°C as much as possible.
100 climate researchers, coordinated by @pik-potsdam.bsky.social & @iiasa.ac.at, released a joint statement to inform the #COP30 negotiations and provide guidance on difficult but doable global efforts designed to limit dangerous overshoot of 1.5°C as much as possible.
Búzios Scientific Statement.pdf
drive.google.com
November 15, 2025 at 4:36 PM
Búzios Scientific Statement
100 climate researchers, coordinated by @pik-potsdam.bsky.social & @iiasa.ac.at, released a joint statement to inform the #COP30 negotiations and provide guidance on difficult but doable global efforts designed to limit dangerous overshoot of 1.5°C as much as possible.
100 climate researchers, coordinated by @pik-potsdam.bsky.social & @iiasa.ac.at, released a joint statement to inform the #COP30 negotiations and provide guidance on difficult but doable global efforts designed to limit dangerous overshoot of 1.5°C as much as possible.
There's an science statement that emerged from this weeks IAMC conference in Buzios, Brasil
5 key insights including 2035 benchmarks for GHG and fossil fuel reductions, PV+Solar upscaling
Check it out here: drive.google.com/file/d/1ofMw...
Open for sign-up here: forms.gle/FPrV3w6cMu8h...
5 key insights including 2035 benchmarks for GHG and fossil fuel reductions, PV+Solar upscaling
Check it out here: drive.google.com/file/d/1ofMw...
Open for sign-up here: forms.gle/FPrV3w6cMu8h...
November 15, 2025 at 1:21 PM
There's an science statement that emerged from this weeks IAMC conference in Buzios, Brasil
5 key insights including 2035 benchmarks for GHG and fossil fuel reductions, PV+Solar upscaling
Check it out here: drive.google.com/file/d/1ofMw...
Open for sign-up here: forms.gle/FPrV3w6cMu8h...
5 key insights including 2035 benchmarks for GHG and fossil fuel reductions, PV+Solar upscaling
Check it out here: drive.google.com/file/d/1ofMw...
Open for sign-up here: forms.gle/FPrV3w6cMu8h...
Reposted by Carl Schleussner
Check out the IEA NZE here tinyurl.com/2ctf7mrx (but ignore the unrealistic-zombie-nightmare (CPS) scenario)
For a nice comparison, see this new high ambition pathway by @climateanalytics.org and the REMIND team at @pik-potsdam.bsky.social - tinyurl.com/y9m8z8jk
For a nice comparison, see this new high ambition pathway by @climateanalytics.org and the REMIND team at @pik-potsdam.bsky.social - tinyurl.com/y9m8z8jk
Rescuing 1.5°C: new evidence on the highest possible ambition to…
This study shows that, even after years of insufficient action, the world can still return to well below 1.5°C of warming this century if countries pursue the “highest possible ambition” in climate ac...
climateanalytics.org
November 12, 2025 at 5:07 PM
Check out the IEA NZE here tinyurl.com/2ctf7mrx (but ignore the unrealistic-zombie-nightmare (CPS) scenario)
For a nice comparison, see this new high ambition pathway by @climateanalytics.org and the REMIND team at @pik-potsdam.bsky.social - tinyurl.com/y9m8z8jk
For a nice comparison, see this new high ambition pathway by @climateanalytics.org and the REMIND team at @pik-potsdam.bsky.social - tinyurl.com/y9m8z8jk
Climate emulators are a great tool to explore a wide range of possible climate futures. Here comes MERCURY - utilising the power of image-compression-based techniques for memory-efficient emulation. Fantastic work led by @shrutinath97.bsky.social agupubs.onlinelibrary.wiley.com/doi/10.1029/...
MERCURY: A Fast and Versatile Multi‐Resolution Based Global Emulator of Compound Climate Hazards
Climate model emulators traditionally generate global fields amounting to Peta-Bytes of data We introduce the emulator MERCURY, that employs a lifting scheme based on image compression techniques...
agupubs.onlinelibrary.wiley.com
November 10, 2025 at 1:36 PM
Climate emulators are a great tool to explore a wide range of possible climate futures. Here comes MERCURY - utilising the power of image-compression-based techniques for memory-efficient emulation. Fantastic work led by @shrutinath97.bsky.social agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Excellent compilation of viewpoints in @natclimate.nature.com on the Paris Agreement Articles. Honoured to have contributed together with a fantastic group of experts. 👇👇👇
Viewpoint: @carlschleussner.bsky.social @paucastro.bsky.social Alexandra Lesnikowski, @adellethomas.bsky.social @romainweikmans.bsky.social @timmonsroberts.bsky.social Ambuj Sagar, Sonia Klinsky, Thomas Bernauer discuss status of #ParisAgreement Articles on it's 10th anniversary rdcu.be/eOBBU
Expert retrospective on a decade of the Paris Agreement
Nature Climate Change - To mark the tenth anniversary of the Paris Agreement, Nature Climate Change asked experts to reflect on the progress of and barriers to several of its key Articles. They...
rdcu.be
November 7, 2025 at 5:30 AM
Excellent compilation of viewpoints in @natclimate.nature.com on the Paris Agreement Articles. Honoured to have contributed together with a fantastic group of experts. 👇👇👇
Reposted by Carl Schleussner
Stories abound these days showing that global warming exceeding 1.5C is now part of science's best estimate.
What does that mean for the #ParisAgreement 1.5C goal?
A good time to revive a thread about a piece we wrote earlier this year on this topic in @science.org 👇🌍🌡️
What does that mean for the #ParisAgreement 1.5C goal?
A good time to revive a thread about a piece we wrote earlier this year on this topic in @science.org 👇🌍🌡️
What becomes of the 1.5°C goal now that global warming is approaching that level?🌍🔥🌡️
In a new @science.org Policy Forum we explain how the 1.5°C goal remains a critical legal & ethical benchmark, even as the world nears and may soon exceed 1.5°C of global warming🧵1/
www.science.org/doi/10.1126/...
In a new @science.org Policy Forum we explain how the 1.5°C goal remains a critical legal & ethical benchmark, even as the world nears and may soon exceed 1.5°C of global warming🧵1/
www.science.org/doi/10.1126/...
The pursuit of 1.5°C endures as a legal and ethical imperative in a changing world
As the world nears 1.5°C of global warming, near-term emissions reductions and adequate adaptation become ever more important to ensure a safe and livable planet for present and future generations
www.science.org
November 6, 2025 at 5:49 PM
Stories abound these days showing that global warming exceeding 1.5C is now part of science's best estimate.
What does that mean for the #ParisAgreement 1.5C goal?
A good time to revive a thread about a piece we wrote earlier this year on this topic in @science.org 👇🌍🌡️
What does that mean for the #ParisAgreement 1.5C goal?
A good time to revive a thread about a piece we wrote earlier this year on this topic in @science.org 👇🌍🌡️
Reposted by Carl Schleussner
COP30: Study reveals “highest possible ambition” for countries' climate pledges
With COP30 kicking off on Monday, a new paper by Julia Schönfeld and Professor Joeri Rogelj provides a framework for assessing countries’ climate pledges 🧵
Learn more: ow.ly/CiB050XnMK2
With COP30 kicking off on Monday, a new paper by Julia Schönfeld and Professor Joeri Rogelj provides a framework for assessing countries’ climate pledges 🧵
Learn more: ow.ly/CiB050XnMK2
COP30: Study reveals “highest possible ambition” for countries' climate pledges | Imperial News | Imperial College London
A new study, for the first time, shows how the ‘highest possible ambition’ of countries' climate pledges can be assessed.
ow.ly
November 6, 2025 at 2:07 PM
COP30: Study reveals “highest possible ambition” for countries' climate pledges
With COP30 kicking off on Monday, a new paper by Julia Schönfeld and Professor Joeri Rogelj provides a framework for assessing countries’ climate pledges 🧵
Learn more: ow.ly/CiB050XnMK2
With COP30 kicking off on Monday, a new paper by Julia Schönfeld and Professor Joeri Rogelj provides a framework for assessing countries’ climate pledges 🧵
Learn more: ow.ly/CiB050XnMK2
Reposted by Carl Schleussner
Excited to announce our #EGU26 session on Climate Risk Assessment for Finance & Insurance Sectors with @mattpriestley.bsky.social A. Ciullo @hcbloomfield19.bsky.social @natalieslord.bsky.social
meetingorganizer.copernicus.org/EGU26/sessio...
@iiasa.ac.at @riskkan.bsky.social @lamont.columbia.edu
meetingorganizer.copernicus.org/EGU26/sessio...
@iiasa.ac.at @riskkan.bsky.social @lamont.columbia.edu
November 4, 2025 at 9:47 AM
Excited to announce our #EGU26 session on Climate Risk Assessment for Finance & Insurance Sectors with @mattpriestley.bsky.social A. Ciullo @hcbloomfield19.bsky.social @natalieslord.bsky.social
meetingorganizer.copernicus.org/EGU26/sessio...
@iiasa.ac.at @riskkan.bsky.social @lamont.columbia.edu
meetingorganizer.copernicus.org/EGU26/sessio...
@iiasa.ac.at @riskkan.bsky.social @lamont.columbia.edu
Reposted by Carl Schleussner
I'm proud to be part of the 2025 #TIME100Climate list of influential leaders.
Link to the full list of 2025 #TIME100Climate
time.com/collections/...
Link to my page in the 2025 #TIME100Climate
time.com/collections/...
Link to the full list of 2025 #TIME100Climate
time.com/collections/...
Link to my page in the 2025 #TIME100Climate
time.com/collections/...
Yann Quilcaille: The 100 Most Influential Climate Leaders of 2025
Find out why Yann Quilcaille is on TIME's 2025 list of the 100 most influential leaders driving business climate action.
time.com
October 30, 2025 at 3:12 PM
I'm proud to be part of the 2025 #TIME100Climate list of influential leaders.
Link to the full list of 2025 #TIME100Climate
time.com/collections/...
Link to my page in the 2025 #TIME100Climate
time.com/collections/...
Link to the full list of 2025 #TIME100Climate
time.com/collections/...
Link to my page in the 2025 #TIME100Climate
time.com/collections/...
Reposted by Carl Schleussner
This is how climate injustice unfolds. There is both an economic logic to cutting emissions now & a moral imperative to rapidly scale up international finance for loss and damage and adaptation in the most vulnerable countries.
⚠️Climate change made Hurricane Melissa four times more likely, rapid study estimates
The most powerful storm in Jamaica’s history shows how climate change is increasing the economic cost, intensity, and likelihood of major storms 🧵
ow.ly/Kazp50Xke8N
The most powerful storm in Jamaica’s history shows how climate change is increasing the economic cost, intensity, and likelihood of major storms 🧵
ow.ly/Kazp50Xke8N
October 30, 2025 at 10:44 AM
This is how climate injustice unfolds. There is both an economic logic to cutting emissions now & a moral imperative to rapidly scale up international finance for loss and damage and adaptation in the most vulnerable countries.
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” 👏👏👏
“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” 👏👏👏
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...
www.nature.com
October 24, 2025 at 10:40 AM
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” 👏👏👏
“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” 👏👏👏
Reposted by Carl Schleussner
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...
🔗 iiasa.ac.at/news/oct-202...
October 24, 2025 at 10:14 AM
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...
🔗 iiasa.ac.at/news/oct-202...
Reposted by Carl Schleussner
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
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...
www.tandfonline.com
October 24, 2025 at 9:40 AM
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
Reposted by Carl Schleussner
Merz & Co wollen die EU-Klimaziele aufweichen?! Nicht mit uns 😡 In einem offenen Brief mit Wissenschaftler*innen fordern wir die Bundesregierung jetzt auf, sich für ein starkes Ziel von mind. 90% Reduktion bis 2040 einzusetzen & nicht noch zu verzögern!
👉 fridaysforfuture.de/offener-brie...
👉 fridaysforfuture.de/offener-brie...
October 20, 2025 at 11:56 AM
Merz & Co wollen die EU-Klimaziele aufweichen?! Nicht mit uns 😡 In einem offenen Brief mit Wissenschaftler*innen fordern wir die Bundesregierung jetzt auf, sich für ein starkes Ziel von mind. 90% Reduktion bis 2040 einzusetzen & nicht noch zu verzögern!
👉 fridaysforfuture.de/offener-brie...
👉 fridaysforfuture.de/offener-brie...
Reposted by Carl Schleussner
🎙️ #EditionZukunft @derstandard.at
Über das Konzept #Overshoot und die Dringlichkeit rascher Reduktion unserer Treibhausgas-Emissionen zur Minimierung der Risiken durch die Erderhitzung.
@carlschleussner.bsky.social vom @iiasa.ac.at im Gespräch mit @philippramer.at
#WissenSchafftKlimaschutz
Über das Konzept #Overshoot und die Dringlichkeit rascher Reduktion unserer Treibhausgas-Emissionen zur Minimierung der Risiken durch die Erderhitzung.
@carlschleussner.bsky.social vom @iiasa.ac.at im Gespräch mit @philippramer.at
#WissenSchafftKlimaschutz
Wie sich das 1,5-Grad-Klimaziel noch retten lässt
Klimaforscher Carl-Friedrich Schleußner erklärt, warum wir nur mehr in der zweit- oder drittbesten Welt leben – und wie sich CO2 aus der Atmosphäre holen lässt
www.derstandard.at
October 11, 2025 at 3:44 PM
🎙️ #EditionZukunft @derstandard.at
Über das Konzept #Overshoot und die Dringlichkeit rascher Reduktion unserer Treibhausgas-Emissionen zur Minimierung der Risiken durch die Erderhitzung.
@carlschleussner.bsky.social vom @iiasa.ac.at im Gespräch mit @philippramer.at
#WissenSchafftKlimaschutz
Über das Konzept #Overshoot und die Dringlichkeit rascher Reduktion unserer Treibhausgas-Emissionen zur Minimierung der Risiken durch die Erderhitzung.
@carlschleussner.bsky.social vom @iiasa.ac.at im Gespräch mit @philippramer.at
#WissenSchafftKlimaschutz
Der @derstandard.at hat unserer Overshoot Konferenz noch ein längeres Interview gewidmet 👇👇👇
www.derstandard.at/story/310000...
www.derstandard.at/story/310000...
derStandard.at
derStandard.at
October 10, 2025 at 8:15 PM
Der @derstandard.at hat unserer Overshoot Konferenz noch ein längeres Interview gewidmet 👇👇👇
www.derstandard.at/story/310000...
www.derstandard.at/story/310000...
Reposted by Carl Schleussner
📰 Your evening read on the IIASA #OvershootConference: @carlschleussner.bsky.social tells @carbonbrief.org that the scientific community is only just “beginning to appreciate” the need to understand & quantify how different overshoot pathways affect adaptation. www.carbonbrief.org/overshoot-ex...
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...
www.carbonbrief.org
October 9, 2025 at 4:30 PM
📰 Your evening read on the IIASA #OvershootConference: @carlschleussner.bsky.social tells @carbonbrief.org that the scientific community is only just “beginning to appreciate” the need to understand & quantify how different overshoot pathways affect adaptation. www.carbonbrief.org/overshoot-ex...
Reposted by Carl Schleussner
NEW – Experts: The key ‘unknowns’ of overshooting the 1.5C global-warming limit | @ceciliakeating.carbonbrief.org and @rtmcswee.carbonbrief.org
Read here: buff.ly/yPWMH59
Read here: buff.ly/yPWMH59
Experts: The key ‘unknowns’ of overshooting the 1.5C global-warming limit - Carbon Brief
On the sidelines of a conference, Carbon Brief asked a range of experts what they consider to be the key “unknowns” around overshoot.
buff.ly
October 8, 2025 at 2:29 PM
NEW – Experts: The key ‘unknowns’ of overshooting the 1.5C global-warming limit | @ceciliakeating.carbonbrief.org and @rtmcswee.carbonbrief.org
Read here: buff.ly/yPWMH59
Read here: buff.ly/yPWMH59
Reposted by Carl Schleussner
Last week, @ceciliakeating.carbonbrief.org and I attended the first-ever conference on climate "overshoot" in Vienna.
Here's our summary of the wide-ranging discussions. (Bearing in mind we were two journalists covering 8 conference themes...!)
Here's our summary of the wide-ranging discussions. (Bearing in mind we were two journalists covering 8 conference themes...!)
NEW – Overshoot: Exploring the implications of meeting 1.5C climate goal ‘from above’ | @ceciliakeating.carbonbrief.org and @rtmcswee.carbonbrief.org
Read here: buff.ly/HWteg9K
Read here: buff.ly/HWteg9K
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...
buff.ly
October 8, 2025 at 3:58 PM
Last week, @ceciliakeating.carbonbrief.org and I attended the first-ever conference on climate "overshoot" in Vienna.
Here's our summary of the wide-ranging discussions. (Bearing in mind we were two journalists covering 8 conference themes...!)
Here's our summary of the wide-ranging discussions. (Bearing in mind we were two journalists covering 8 conference themes...!)
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...
www.carbonbrief.org/overshoot-ex...
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...
www.carbonbrief.org
October 8, 2025 at 1:16 PM
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...
www.carbonbrief.org/overshoot-ex...
Reposted by Carl Schleussner
✨ The reflections sent a powerful message: overshoot is not just a scientific scenario, it is a lived reality that compounds risks, deepens inequities, & raises questions of justice. Responding requires courage, collaboration, & commitment across all levels of society.
ℹ️ overshootconference.org
ℹ️ overshootconference.org
Overshoot |
overshootconference.org
October 2, 2025 at 4:56 PM
✨ The reflections sent a powerful message: overshoot is not just a scientific scenario, it is a lived reality that compounds risks, deepens inequities, & raises questions of justice. Responding requires courage, collaboration, & commitment across all levels of society.
ℹ️ overshootconference.org
ℹ️ overshootconference.org
Reposted by Carl Schleussner
In Ö entfallen mehr als 50 % der #Treibhausgase auf die obersten 10 %. 🏭💨
Höchste Zeit, Reiche und Konzerne stärker in die Pflicht zu nehmen, meinen @nicolasprinz.bsky.social, @sixev4.bsky.social & Judith Derndorfer: www.awblog.at/klima-energi...
Höchste Zeit, Reiche und Konzerne stärker in die Pflicht zu nehmen, meinen @nicolasprinz.bsky.social, @sixev4.bsky.social & Judith Derndorfer: www.awblog.at/klima-energi...
October 2, 2025 at 7:56 AM
In Ö entfallen mehr als 50 % der #Treibhausgase auf die obersten 10 %. 🏭💨
Höchste Zeit, Reiche und Konzerne stärker in die Pflicht zu nehmen, meinen @nicolasprinz.bsky.social, @sixev4.bsky.social & Judith Derndorfer: www.awblog.at/klima-energi...
Höchste Zeit, Reiche und Konzerne stärker in die Pflicht zu nehmen, meinen @nicolasprinz.bsky.social, @sixev4.bsky.social & Judith Derndorfer: www.awblog.at/klima-energi...
Reposted by Carl Schleussner
🧵 As the #OvershootConference drew to a close today, the final plenary offered a space to step back and reflect across themes. What stood out was both the urgency and interconnectedness of the challenges we face when confronting climate overshoot:
October 2, 2025 at 4:45 PM
🧵 As the #OvershootConference drew to a close today, the final plenary offered a space to step back and reflect across themes. What stood out was both the urgency and interconnectedness of the challenges we face when confronting climate overshoot: