I was honoured to deliver the final declaration of the Global Ocean Summit (GOS). It focuses on ocean observation ahead of #OceanObs29. It will be published on the GOS website next week: www.laoshanglobal.com/global-ocean... @cnrs.fr @iddri.bsky.social @sorbonne-universite.fr

The International Advisory Committee and Program Committee of #OceanObs29 are meeting to advanced planning as part of the Global Ocean Summit. Further information is forthcoming. 🌊 www.oceanobs29.net

‼️Check out our new paper led by Linn J. Hoffmann and @bachlennart.bsky.social on "Monitoring, reporting, and verification of marine carbon dioxide removal: exploring scientific consensus and divergences across continents". #mCDR 🌊 @imev-mer.fr @iddri.bsky.social online.ucpress.edu/elementa/art...

1° à 1,5° au dessus des normes d'Avril : une température des eaux en Méditerranée alarmante ? Quelles conséquences ? 🎥 Reportage #France3 #ICINice 29/04 19/20 avec Steeve Comeau #lov (seq. 3mn-5mn) 👉 shorturl.at/PVynZ 📌 Article #NiceMatin @jpgattuso.bsky.social #lov 👉 l.nicematin.com/NnE

Very exciting and fully funded PhD project available on 'Carbonate chemistry and alkalinity dynamics in the coastal ocean'. Go work with Sebastiaan van de Velde in beautiful Dunedin, New Zealand! 🌊🧪🌍 www.otago.ac.nz/postgraduate...

The last issue of the Limnology and Oceanography Bulletin includes an obituary of our colleague Dr. Fereidoun Rassoulzadegan, former director of our laboratory, prepared by John R. Dolan. @aslo.org 🌊 aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

‼️ New paper, led by @jerem-carlot.bsky.social. Transplantations at CO₂ vents reveal that declining pH drives community shifts: - photosynthesis and nutrient uptake increase - biomass and calcification decrease onlinelibrary.wiley.com/doi/10.1111/... @imev-mer.fr @iddri.bsky.social 🌊

« Japan and the U.S. Agree to Team Up on Seabed Mining The arrangement could signal a fracture in the decades-long effort among nations to reach consensus on how to mine the ocean floor while protecting ecosystems. » 🌊 www.nytimes.com/2026/03/27/c....

It is a tremendous privilege to be elected to The Norwegian Scientific Academy for Polar Research (www.polar-academy.com). I am deeply thankful to my colleagues for their support and confidence, especially to Grete Hovelsrud and Geir Gabrielsen. 🌊 @cnrs.fr @sorbonne-universite.fr @iddri.bsky.social

3/3 In my view, the editor’s decision to publish a rebuttal that fails to address the core issues was a poor choice. - Original paper: pubmed.ncbi.nlm.nih.gov/40892922 - Our letter: pubmed.ncbi.nlm.nih.gov/41758658 - The reply: pubmed.ncbi.nlm.nih.gov/41758660 🌊

1/x We highlight several flaws and demonstrate that this bold claim lacks data and literature support. It is disheartening that the response (links below) does not adequately address our concerns. 🌊

1/x ‼️ Check out our letter to @pnas.org, led by Fabrice Pernet, which discusses a paper claiming "Oyster farming acts as a marine carbon dioxide removal (mCDR) hotspot for climate change mitigation." 🌊 doi.org/10.1073/pnas...

www.nytimes.com/2026/02/28/c... 🌊

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‼️New paper led by Liqing Jiang. Overview of 68 existing ocean carbonate chemistry data products and data product sets: compilations of cruise datasets, derived gap-filled data products, model simulations. @cnrs.fr @iddri.bsky.social @sorbonne-universite.fr @imev-mer.fr doi.org/10.5194/essd...

3/3 Correcting all errors would be time-consuming, and it is unclear whether edits would be retained. I would welcome colleagues’ views on how best to handle this, as it is worrying to see such misleading content circulating. 🌊

2/3 The page raises concerns: it contains numerous factual inaccuracies about my career, and a section titled “Debates and Critiques in Research Field” misrepresents and criticises findings from papers I co-authored, without citing a single peer-reviewed source. 🌊

1/3 I recently discovered, via a search engine, that an article about me has appeared on Grokipedia, described on Wikipedia as an AI-generated online encyclopedia. 🌊

🌊 Merci @cnrscotedazur.bsky.social !

2/2 Thank you to my family, colleagues, students, and partners — @cnrs.fr @sorbonne-universite.fr @iddri.bsky.social — for your trust, rigor, and collaboration. Without you, this honour would not exist. It belongs to you as much as to me. 🌊

1/2 Receiving the insignia of Knight of the Legion of Honour — France’s highest distinction — is an honour I accept with humility and gratitude. My work in oceanography at @cnrs.fr lies at the heart of this recognition. 🌊 #LegionOfHonor #Oceanography #Climate @imev-mer.fr @iddri.bsky.social

Société Générale: Stop Financing Adani's Coal action.eko.org/a/societe-ge...

Retiring as emeritus, I thank @cnrs.fr for its Medal of Honor. Planets embody astronomy, humanity’s first science. Cuneiform quote from the epic of Gilgamesh (7th c. BCE): “He who saw all, knew the hidden, revealed the secret.” @cnrscotedazur.bsky.social @imev-mer.fr

Ten years ago today, the Paris Agreement was adopted — a landmark achievement in multilateral diplomacy. May the spirit of Paris be rekindled to help navigate today’s challenges in global cooperation.

Sargassum galore in today's issue of Nature Geosciences! doi.org/10.1038/s415... 🌊

‼️ Check out our new paper led by Laura Castro de la Guardia. We estimate the potential kelp biomass from seafloor irradiance. Predicted potential kelp biomass in 6 Arctic fjords in good agreement with published values. 🌊 @iddri.bsky.social @cnrs.fr aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

Thanks to Fei Chai and Minhan Dai (Xiamen University) for their invitation to give a seminar on "Ocean science meets diplomacy" based of the links between the One Ocean Science Congress #OOSC and #UNOC3. Further reading: aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

‼️ Check out our new paper led by Devi Veytia on "A machine learning-based evidence map of ocean-related options for climate change mitigation and adaptation". @cnrs.fr @iddri.bsky.social @sorbonne-universite.fr @imev-mer.fr 🌊 doi.org/10.1038/s441...

Honored to be a co-signatory, with other distinguished people, of this commentary led by Prince Albert II of Monaco that promotes a sustainable ocean economy. @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr 🌊#BlueEconomy

Also, congratulations to @scottdoney.bsky.social who is also a 2025 Highly Cited Researcher. It is great to be in such wonderful company!

I am honored to be named again among the Highly Cited Researchers. Deep thanks to the students, colleagues, and partners whose work, reviews, and open data enable rigorous research. 🌊 @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr @imev-mer.fr clarivate.com/highly-cited...

🌊 Utiliser la machine océanique pour éliminer/réduire le CO2 : des méthodes, oui, mais tiennent-elles leur promesses ? "Les promesses de la pompe océanique" 🫧 #scienceetavenir N°945 à lire dans le dossier consacré au #climat 🌤️ @jpgattuso.bsky.social

Here is a good explanation of ocean oxygen and why it’s more nuanced than often presented 🌊 theconversation.com/humans-will-...

📣 🌊 New funding opportunity! Carbon to Sea and the Prince Albert II of Monaco Foundation invite proposals to study how ocean alkalinity enhancement (#OAE) affects key marine species. Two 24-month projects will be funded. Apply by 16 January 2026. #mCDR ➡️ www.carbontosea.org/rfp-effect-o...

"#NOAA reportedly sent a draft rule to the White House that would merge exploration and production permits for deep-sea mining, a move that would speed up efforts to allow companies to harvest mineral-rich nodules in the Pacific Ocean." #DeepSeaMining 🌊 oceanpolicy.substack.com/p/shutdown-p...

2/2 🌊 - The “CDR tax" is a negative Earth System feedback which opposes the decrease in atmospheric CO2 - The One-Earth CDR framework considers land CDR and marine CDR together within the interconnected Earth System, recognizing that interventions in one reservoir trigger feedbacks in others

1/2 🌊 ‼️ Check out our new paper led by Phil Boyd "Effective carbon dioxide removal requires a One-Earth approach": doi.org/10.1088/1748... #CDR @yiannismous.bsky.social #LouisLegendre #JuliaPongratz @imev-mer.fr @iddri.bsky.social @cnrs.fr

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‼️ Check out our new paper (in French) led by Sébastien Treyer on the linkages between the One Ocean Science Congress and the 3rd United Nations Ocean Conference #OOSC #UNOC3 #FrançoisHoullier @ifremer.bsky.social #LOV @iddri.bsky.social @cnrs.fr www.nss-journal.org/articles/nss...

The European Geosciences Union (EGU @egu.eu) creates an "Emergency Support Policy, to provide assistance to any researcher in the field of Earth, planetary and space science affected by disaster, crisis or conflict anywhere in the world".

Let us express our solidarity with US colleagues affected by the federal shutdown and firings. #shutdown fromtheprow.agu.org/agu-condemns...

‼️ Check out our new paper on "Ocean Science Meets Diplomacy: Contribution of the One Ocean Science Congress to the Third United Nations Ocean Conference". 🌊 #OOSC #UNOC #Ocean #Diplomacy @cnrs.fr @sorbonne-universite.fr @iddri.bsky.social doi.org/10.1002/lob....

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"UN politics won’t deliver an ambitious plastics treaty" #plastic #pollution www.science.org/doi/10.1126/...

A disaster for ocean and climate research is unfolding before our eyes. #NOAA 🌊 "The White House Office of Management and Budget is pulling back $239 million in funds Congress already provided. The biggest hits fall on climate and ocean research." oceanpolicy.substack.com/p/roundup-un...

It would be great if @oceana.bsky.social could avoid propagating scientifically inaccurate statements. 🌊 #oxygen theconversation.com/humans-will-...

A thoughtful Op-ed has just been published in @bangordailynews.bsky.social. Prof. Shick of @umaine.bsky.social highlights the One Ocean Science Congress (#OOSC), the Third United Nations Ocean Conference (#UNOC), their interconnections, and US involvement. www.bangordailynews.com/2025/08/13/o...

The Australian 🇦🇺 climate change Authority just released a report on the climate threats to the Great Barrier Reef. 🪸 I hope the Aus Govt is listening. 70-90% will be gone at 1.5-2c warming. 🌊 #climateactionnow if we care about the Australian coral reefs - GBR, Ningaloo and the southern reef.

This false assertion about the ocean producing 50% of the oxygen we breathe is so widespread that @jpgattuso.bsky.social @bopplaurent.bsky.social and others have written about it here.

Congress Rejects Trump Administration’s Cuts to #NOAA Both House and Senate reject the Trump Administration’s push to eliminate NOAA’s Office of Oceanic and Atmospheric Research (OAR) along with several longstanding and popular programs 🌊 www.espadvisor.com/post/congres...