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Roland Séférian

@rolandseferian.bsky.social
3.4K followers 164 following 14 posts

climate scientist at #CNRM @meteofrance | focus on #CarbonCycle & its iterations with climate | @IPCC_CH SR15 & AR7 | @esm2025.bsky.social

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Roland Séférian @rolandseferian.bsky.social · 30/11/2025
Sad and happy at the same time ! Sad to see this adventure coming to an end. Happy to see how much we achieved and how influential this project has been. To the team, colleagues, and friends: thank you so much for these 4.5 years!
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Roland Séférian @rolandseferian.bsky.social · 21/11/2025
Timely research highlight on land-based carbon dioxide removal approches developped by a great team !
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Anna Harper (she/her) @docaharper.bsky.social · 19/11/2025
Excellent summary of the work I contributed to in @esm2025.bsky.social, an EU-funded project that ends this year. Here are my key take-aways in a 🧵 , but I recommend reading this Research Highlight if you want to know more! Several papers are in preparation from this work, so stay tuned.
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Prof. Sonia I Seneviratne @soniaseneviratne.bsky.social · 06/09/2025
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
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Philippe Quirion @philippequirion.bsky.social · 05/09/2025
www.hautconseilclimat.fr/actualites/o...
hautconseilclimat.fr
Objectif climatique européen 2040 et COP 30 : une proposition de la France menace l’Accord de Paris — Haut Conseil pour le Climat
Paris, le 5 septembre 2025 – Au moment des négociations européennes sur les objectifs climatiques de l’Union européenne pour la […]
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Le Monde @lemonde.fr · 25/08/2025
Valérie Masson-Delmotte : « La situation climatique va encore empirer, mais le danger vient aussi d’un déni collectif »
lemonde.fr
Valérie Masson-Delmotte : « La situation climatique va encore empirer, mais le danger vient aussi d’un déni collectif »
Après un été marqué les incendies et la canicule, la climatologue, membre du Haut Conseil pour le climat, redoute un oubli rapide par la population, et regrette le manque de responsabilité du personnel politique.
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IPCC @ipcc.bsky.social · 18/08/2025
The #IPCC has announced the authors selected for its Seventh Assessment Report. 664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors. 🌍 51% from developing countries 🚺 46% women 🔗 bit.ly/AR7AuthorsPR
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Christophe Cassou @cassouman40.bsky.social · 23/07/2025
Un jour historique! La CIJ: "Pour garantir la jouissance effective des droits de l’homme, les États doivent prendre des mesures pour protéger le syst. climatique & d’autres composantes de l’environnement" Les pétitionnaires #LoiDuplomb ne demandent rien d'autre! www.lemonde.fr/planete/arti...
lemonde.fr
La « violation » des obligations climatiques par un Etat constitue « un fait internationalement illicite engageant sa responsabilité », déclare la CIJ dans un avis historique
La Cour internationale de justice, la plus haute juridiction de l’ONU, rend un avis très attendu sur les obligations légales des Etats concernant le changement climatique.
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Bon Pote @bonpote.com · 23/07/2025
1.8 millions de signatures, et si le rythme reste le même, ce sera 2 millions avant demain soir. C'est historique. En plein été ! Chaque like, chaque partage, chaque signature compte. Lien vers la pétition : petitions.assemblee-nationale.fr/initiatives/...
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Samuel Morin @smlmrn.bsky.social · 20/07/2025
#EUBURN is an ambitious research program coordinated by @cyrielledenjean.bsky.social at #CNRM @meteofrance.com @cnrs.fr on #fire properties & atmospheric effects from in-situ aircraft & ground-based measurements, remote sensing & modeling approaches. 1st field campaign underway euburn.aeris-data.fr
euburn.aeris-data.fr
EUBURN – The southern Europe biomass burning project
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Bon Pote @bonpote.com · 19/07/2025
400 000 signatures dont 100 000 en 5h 🤯 Dernière ligne droite. Chaque like, chaque partage, chaque signature compte. L’objectif des 500 000 signatures est possible d’ici dimanche soir, afin d’obtenir un vrai débat à l’Assemblée nationale sur la loi Duplomb.
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Wolfgang Cramer @cramer-bondeau.fr · 17/07/2025
Ceci est une pétition d'une importance exceptionnelle pour la santé publique, l'environnement et même la démocratie. Je vous invite tous à la signer : "Non à la Loi Duplomb — Pour la santé, la sécurité, l’intelligence collective" >118000 dèjà petitions.assemblee-nationale.fr/initiatives/...
logo du site des petitions
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Météo-France @meteofrance.com · 08/06/2025
#JournéeMondialeDesOcéans | 🌊 Sur l’ensemble des #océans, la fréquence des canicules marines a doublé depuis 1982, et leur intensité augmente. 🌐 Dans le futur, elles seront 20 fois plus fréquentes avec un réchauffement de 2 °C. www.youtube.com/watch?v=g54i...
youtube.com
Que fait Météo-France pour surveiller les canicules marines ?
YouTube video by METEO FRANCE
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David Ho @davidho.bsky.social · 04/05/2025
I think a lot about what Carl Sagan said in one of his final interviews.
"WE'VE ARRANGED A society based on science and technology, in which nobody understands anything about science technology. And this combustible mixture of ignorance and power, sooner or later, is going to blow up in our faces. Who is running the science and technology in a democracy if the people don't know anything about it?"
"Science is more than a body of knowledge, it's a way of thinking. A way of skeptically interrogating the universe with a fine understanding of human fallibility. If we are not able to ask skeptical questions, to interrogate those who tell us that something is true, to be skeptical of those in authority, then we're up for grabs for the next charlatan, political or religious, who comes ambling along."
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David Ho @davidho.bsky.social · 02/05/2025
More about threats to NOAA/GFDL.
propublica.org
White House Proposal Could Gut Climate Modeling the World Depends On
Potential funding cuts for NOAA and its research partners threaten irreparable harm not only to climate research but to American safety, competitiveness, and national security.
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Prof. Tatiana Ilyina @tatianailyina.bsky.social · 27/04/2025
On this sunny pre- #EGU25 day @chrisd-jones.bsky.social @pfriedling.bsky.social @rolandseferian.bsky.social and me, with colleagues will continue the effort to assess the Transient Climate Response to cumulative carbon Emissions (TCRE): www.wcrp-climate.org/slc-events-o... @wcrpclimate.bsky.social
wcrp-climate.org
Assessing the Transient Climate Response to Emissions (TCRE) and Zero Emissions Commitment (ZEC) Workshop 2025
Assessing the Transient Climate Response to Emissions (TCRE) and Zero Emissions Commitment (ZEC) Workshop 2025
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Magali Reghezza @magalireghezza.eurosky.social · 09/04/2025
L'extrême-droite n’est pas climatosceptique et dit vouloir agir pour le climat. L’extrême droite et ses alliés déposent un amendement pour supprimer le Haut Conseil pour le Climat. Une de ces deux affirmations est fausse. bonpote.com/lextreme-dro...
bonpote.com
L'extrême droite dépose un amendement pour supprimer le Haut Conseil pour le Climat
Le Haut conseil pour le climat (HCC) est un organisme indépendant chargé d’évaluer l’action publique en matière de climat, et sa
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Valérie Masson-Delmotte @valmasdel.bsky.social · 05/04/2025
"many marine-climate interventions are currently being tested and deployed in an under-regulated pseudo-scientific bubble" www.nature.com/articles/s41...
nature.com
Novel marine-climate interventions hampered by low consensus and governance preparedness - Nature Climate Change
Oceans are on the front line of new planned climate actions, but understanding of novel marine-climate intervention development and deployment remains low. Here a survey among intervention practitione...
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Sherilee Harper @sherilee.bsky.social · 31/03/2025
Important IPCC Session! It will be critical for IPCC AR7 to meaningfully and ethically engage with Indigenous Knowledges. Join our session co-hosted by @ipcc.bsky.social, Inuit Circumpolar Council, and Assembly of First Nations. Registration links in thread below...
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Thibault Guinaldo @tguinaldo.bsky.social · 27/03/2025
Aujourd'hui est un jour spécial puisqu'à eu lieu la réunion de lancement du projet @agencerecherche.bsky.social Jeune Chercheur SAMOUSSA. Ce projet basé au CNRM (@meteofrance.com @cnrs.fr) en collaboration avec le LEGOS (@ird-fr.bsky.social) porte sur un meilleur suivi et compréhension des Sargasses
Diaporama de présentation du projet ANR SAMOUSSA présenté le 27/03/2025
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Gonéri Le Cozannet @goneri76.bsky.social · 22/03/2025
Il me semble que nous pouvons déjà tirer quelques leçons en 🇨🇵🇪🇺 de ce qu'il se passe aux 🇺🇲 actuellement: 1. Il n'y a aucune raison de croire que des partis qui se sont construits sur la haine de la démocratie, de l'état de droit et de la diversité gouvernent en conservateurs modérés une fois élus.
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AGU (American Geophysical Union) @agu.org · 20/03/2025
🚨Calling U.S.-based climate experts! The newly formed U.S. Academic Alliance for the @ipcc.bsky.social is now accepting nominations for the Seventh Assessment Report.🌍 Join a global network of scientists shaping the future of climate action. Apply by April 4: buff.ly/hDrBH1F #IPCC #AGU
buff.ly
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Prof Julia Steinberger 🌹🌱🌍 #ClimateAction #Fightfascism @jksteinberger.bsky.social · 15/03/2025
I really don't think this news has made sufficient shock waves. Dr Katherine Calvin, NASA Chief Scientist Trump-Musk just fired, is the highest ranking American on the Intergovernmental Panel on Climate Change, the IPCC. She is co-chair of Working Group 3 on mitigation. This is a climate attack.
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Pierre Gentine @pierregentine.bsky.social · 08/03/2025
www.nytimes.com/2025/03/07/n... - Columbia is being dramatically cut and I hope that the place I have called home for 15 years with many fantastic colleagues will survive this attack - it is clearly not related to antisemitism but Columbia had been defined as the number one target in academia
nytimes.com
Trump Administration Cancels $400 Million in Federal Funds to Columbia University
The Trump administration blamed the university’s failure to protect Jewish students from harassment during protests last year over the war in Gaza.
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Glen Peters @glenpeters.bsky.social · 13/11/2024
📢Global Carbon Budget 2024📢 Despite some predicting a peak in global fossil CO2 emissions, we estimate growth of 0.8% [-0.3% to 1.9%] in 2024. Maybe a peak next year? Is it all bad news, or can we find some good news? essd.copernicus.org/preprints/es... 1/
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CNRS @cnrs.fr · 14/03/2025
🇪🇺 In an open letter published on March 12, Europe's leading science institutions, including the @cnrs.fr, join forces to call for a strong framework program for research and innovation. www.cnrs.fr/en/update/eu...
cnrs.fr
Europe: an open letter calling for massive support for research and innovation
In an open letter published on March 12, Europe's leading science institutions, including the CNRS, join forces to call for a strong framework program for res
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Magali Reghezza @magalireghezza.eurosky.social · 11/03/2025
« Face au défi climatique, la seule réponse, c’est s’adapter ». FAUX. La SEULE réponse est la neutralité des émissions. Le PNACC est indispensable pour s’adapter à un climat DÉJÀ réchauffé et préparer la suite. Mais à +3ºC monde (4ºC France), on ne s’adapte plus. On choisit qui on sauve.
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Météo-France @meteofrance.com · 07/03/2025
Météo-France exprime sa solidarité avec les chercheuses et chercheurs du monde entier, en particulier aux USA. Dans un contexte où les effets du changement climatique ne cessent de s'aggraver, la science doit rester notre boussole pour guider nos actions face au défi du siècle. #StandUpForScience
Image satellite prise en septembre 2024, montrant l'activité cyclonique sur l'Atlantique.
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Stand Up For Science France @standupforscifr.bsky.social · 07/03/2025
2000 personnes à Toulouse pour défendre les sciences ! #StandUpForScience
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Valérie Masson-Delmotte @valmasdel.bsky.social · 06/03/2025
Approved AR7 WG outlines, but... no plain language summaries; no expert meeting on tipping points; no agreement on the methodological report on carbon dioxide removal; and no agreed timeline for AR7 reports. www.carbonbrief.org/ipcc-report-...
carbonbrief.org
IPCC report timeline still undecided after ‘most difficult’ meeting in China - Carbon Brief
IPCC meeting in Hangzhou, China, marked the third time that governments have failed to agree on a timeline for the organisation’s AR7.
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Valérie Masson-Delmotte @valmasdel.bsky.social · 04/03/2025
Défendons les sciences face aux nouveaux obscurantismes 1/... www.lemonde.fr/sciences/art...
lemonde.fr
« Défendons les sciences face aux nouveaux obscurantismes »
TRIBUNE. En écho au mouvement américain de protestation contre la politique de Donald Trump, un collectif de personnalités françaises appelle citoyens et scientifiques à rejoindre le mouvement « Stand...
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JB Sallée @jbsallee.bsky.social · 04/03/2025
🌊 🚨 Postdoc position alert 🚨 🌊 The Future Evolution of Global Ocean Overturning Cells at Different Global Warming Levels (2 years) Deadline for application: 1 April 2025 Supervisors: Jean-Baptiste Sallée, Roland Séférian Location: CNRM, Toulouse, France More info: docs.google.com/document/d/1...
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Roland Séférian @rolandseferian.bsky.social · 04/03/2025
Amazed to see how far our (crazy idea) grow that much !
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Valérie Masson-Delmotte @valmasdel.bsky.social · 03/03/2025
www.nature.com/articles/d41...
nature.com
US universities curtail PhD admissions amid Trump science funding cuts
Nature talks to prospective students left in limbo as some institutes withdraw offers and put applications on hold.
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Gerrit Hansen @hanseng.bsky.social · 02/03/2025
Last night, the #IPCC agreed the outlines for the 3 WG reports of #AR7, and invited work to start with author nominations (call likely out some time next week) and joint LAMI in Q4 2025 in Paris (tbd) - it's a go, finally! However publication schedule tbd further at P63 in Peru
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Valérie Masson-Delmotte @valmasdel.bsky.social · 28/02/2025
theconversation.com/trumps-war-o...
theconversation.com
Trump’s war on climate science is pushing us into a dystopian future
Withdrawing support for research and scrubbing climate data from US government websites has repercussions for Australia and the world. But there are ways around it.
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Tim Kaiser @tkaiser.science · 25/02/2025
It’s about time. chng.it/JCq6yZfh75i
chng.it
Sign the Petition
Petition to Ban Platform X (formerly Twitter) in the European Union
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Katharine Hayhoe @katharinehayhoe.com · 21/02/2025
‼️The US-based @ipcc.bsky.social technical support unit (TSU) for Working Group 3 Co-Chairs has been terminated, and the US won’t be attending next week’s IPCC meeting where the AR7 chapter outlines will be approved. More by @afreedma.bsky.social here:
axios.com
Scoop: U.S. delegation pulled from key U.N. climate science meeting
The IPCC meeting in China is slated to determine the content in the group's next series of reports.
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Bon Pote @bonpote.com · 05/02/2025
Ce qu'il se passe aux Etats-Unis est extrêmement grave : des employés du DOGE, le ministère d'Elon Musk, ont pénétré le siège de la NOAA et auraient cherché à accéder aux systèmes informatiques de l'agence que le projet 2025 a qualifiée de « nuisible à la prospérité des États-Unis ».
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ESM2025 @esm2025.bsky.social · 07/01/2025
🌍 #ClimateResearchNet Starter Pack is here! 🛠️ Discover the EU climate research projects in our communication network that are already on Bluesky! 💬 Follow our community & amplify climate research impact!✨ 📦 go.bsky.app/LQkEWKx #ClimateResearch #Scicomm
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Roland Séférian @rolandseferian.bsky.social · 04/01/2025
@afpfr.bsky.social est-ce sérieux ? "prises de position controversées" ? "prise de position climatosceptique" serait plus exact
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Rémi Noyon @reminoyon.bsky.social · 03/01/2025
Cette semaine, dans 420ppm, je reviens sur le terme “géo-ingénierie”. Pourquoi continuer de l’utiliser alors que le GIEC s’en est éloigné, préférant parler de modification du rayonnement solaire et d’émissions négatives ? 420ppm.substack.com/p/gramsci-la...
420ppm.substack.com
Pourquoi parler de géo-ingénierie alors que le Giec n'emploie plus ce terme ?
Cette semaine, Gramsci, la fabuleuse Île de l'Energie et le schéma de la serviette.
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Peter Gleick @petergleick.bsky.social · 25/12/2024
If you've never donated to Wikipedia, now's the time. Elon Musk is attacking it because it's one of the only sources of honest, curated information that he can't control. www.newsweek.com/elon-musk-ta...
newsweek.com
Elon Musk takes aim at Wikipedia
The billionaire has become one of the most prominent supporters of President-elect Donald Trump.
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Ben Sanderson @benmsanderson.bsky.social · 20/12/2024
We tried to make #CMIP7 an inclusive, taking into account modeling centers and community needs. The design, I hope, reflects that -targeted on a tight timeline with flexibility to support a wide range of ESM science. So pls read, comment and start thinking about cool ways you can use this ensemble.
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ESM2025 @esm2025.bsky.social · 18/12/2024
🌍 Big news! Many EU climate research projects from the #ClimateResearchNet are making the leap to BlueSky! 🦋 To help you connect with us all in one place, we’ve put together this handy starter pack. Let’s keep climate research conversations going strong on this new platform! 💬👉 go.bsky.app/LQkEWKx
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Rosie Fisher @rosieafisher.bsky.social · 17/12/2024
Joined a fantastically interesting workshop on TCRE and ZEC last night If you have ideas on the assessment and definition of TCRE or ZEC (including on whether ZEC is even a useful/real concept) submit to this EGU session! 👇 1/2
wcrp-climate.org
Safe Landing Climate Workshop on Assessing TCRE and ZEC
Safe Landing Climate Workshop on Assessing TCRE and ZEC
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Prof. Sonia I Seneviratne @soniaseneviratne.bsky.social · 16/12/2024
The @ipcc.bsky.social #AR7 scoping meeting successfully took place in Kuala Lumpur last week, with more than 230 experts from 70 countries drafting the outlines of the three Working Group contributions to #IPCC's seventh report assessing policy-relevant science on #climatechange.
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Roland Séférian @rolandseferian.bsky.social · 29/11/2024
Soutien à @ericlagadec.bsky.social ! Grosse tendance Toquevillienne où tout est mis au même niveau…
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ESM2025 @esm2025.bsky.social · 25/11/2024
🧗 Calling all Early Career Researchers! Your insights are essential. Help us shape better support for ECRs in EU projects by taking this short survey: 📋 bit.ly/surveyECR Let’s ensure ECR voices are heard! #YESS2Science #EarlyCareerScientists #ClimateResearchNet
person on a bike in a place where the road disappears in the horizon between sky and water
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