Dewi Le Bars

Aujourd’hui sort mon nouveau livre «Les milliardaires ne paient pas d’impôt sur le revenu et nous allons y mettre fin.»🧵

Screenshot that says "Sea Ice Today" and "Ice Sheets Today" Services Reduced. More information is stated: "Beginning October 15, 2025, NSIDC’s Sea Ice Today and Ice Sheets Today services will be reduced because of non-renewed funding. This means no new monthly and mid-month analysis posts for Sea Ice Today or regular posts for Ice Sheets Today, limited comparison tools, and reduced user support."

UGH! When will it end. 😭

"Effective October 15, 2025, due to non-renewed funding, NSIDC has suspended or reduced several Sea Ice Today tools and services."

nsidc.org/data/user-re...

Increased future ocean heat uptake constrained by Antarctic sea ice extent Abstract. The ocean takes up over 90 % of the excess heat stored in the Earth system as a result of anthropogenic climate change, which has led to sea level rise and an intensification of marine extre...

Future atmospheric and ocean warming over the 21st century might be larger than previously expected based on a new study by @linusvogt.bsky.social

Linus & I developed the idea during Linus research visit with me at @whoi.edu and turned it then into this paper:

esd.copernicus.org/articles/16/...

We used to throw this one around back in the day...

He uses statistics like a drunk uses a lamp post, for support rather than illumination.

Je sais pas comment remercier @fabricearfi.bsky.social et toutes celles et ceux qui aujourd'hui tiennent la tranchée face à la déferlante contre notre démocratie.
J'espère que l'entendre aura fait réfléchir nombreux et nombreuses.
Merci.

Parfois c’est ce qui nous est le plus proche que l’on met le plus de temps à voir.

Pendant quinze ans j’ai cartographié les grandes fortunes mondiales, objectivé leurs techniques pour contourner l’impôt dans les paradis fiscaux, du Luxembourg aux îles vierges britanniques... 🧵

Elle pourrait faire mieux : accélérer sur la sortie des fossiles tout court et ainsi bénéficier des bénéfices climat/sante/biodiversité/indépendance des politiques climatiques.

Defra rejects recommendations for whole-site bans on bottom trawling and a new policy statement - Ocean and Coastal Futures Ocean and Coastal Futures - We’re all about connecting people – organising events, creating communications and promoting job opportunities.

⚠️ UK Govt has dismissed the Environmental Audit Committee’s call for full bottom trawling bans in marine protected areas, calling it "disproportionate". Despite the evidence showing full bans are the ONLY way to truly protect ocean wildlife 🌊 1/2
www.cmscoms.com?p=45180

Frontiers | Safeguarding the polar regions from dangerous geoengineering: a critical assessment of proposed concepts and future prospects Fossil-fuel burning is heating the planet with catastrophic consequences for its habitability and for the natural world on which our existence depends. Halti...

New paper out today led by Martin Siegert with about 40 others where we argue that some of the proposed Polar #Geoengineering schemes for ice sheets, sea ice and solar radiation are potentially dangerous and unethical.

www.frontiersin.org/journals/sci...

Update on this thread: Thanks to the feedback on this thread, I realized the methodological problems with the Voortman and De Vos (2025) paper (which the New York Post heralded as "Rising-sea hysteria debunked") went deeper than I originally realized, and clearly necessitate retraction. 1/

I would love for someone to do an analysis about how an error-ridden paper by unaffiliated researchers in a low-quality journal has gotten such rapid media attention.

⚠️Safe underground carbon storage could reduce warming by 10 times less than previously thought.

New research by @iiasa.ac.at with scientists from @imperialcollegeldn.bsky.social mapped safe areas that can be used for underground carbon storage 🧵

A series of maps of emissions across Europe for different livestock

New data paper out: Ammonia doesn't often make the headlines – but it’s one of the major drivers of biodiversity loss and air pollution in Europe, harming ecosystems and our health. > 90% of it in Europe comes from one source: agricultural fertiliser and manure 🧵

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

Evaluating IPCC Projections of Global Sea‐Level Change From the Pre‐Satellite Era IPCC projections in the mid-1990s of global sea-level change over the next 30 years were remarkably robust The largest disparities between projections and observations were due to underestimated ...

IPCC projections in the mid-1990s of global sea-level change over the next 30 years were remarkably robust - important for confidence in future projections.

The largest disparities were due to underestimated dynamic mass loss of ice sheets

agupubs.onlinelibrary.wiley.com/doi/10.1029/...

Antarctica's sea level contribution:

Meltwater from Antarctica may "put a lid" of freshwater on the Southern Ocean and thereby trap heat there leading to enhanced melting.

New paper by Lambert, Le Bars, van der Linden, Jüling, and Drijfhout

esd.copernicus.org/articles/16/...

The Israeli government has adopted the double-strike tactic used by Bashar al-Assad in Syria: target a hospital or heavily populated area, then hit it again when rescue workers, reporters and medics turn up, to kill or maim them too. Hideous war crimes piled one upon another.

Antarctic Dense Water Formation Sensitivity to Ocean Surface Cell Thickness The ability of ocean models with depth coordinates to form Antarctic Dense Shelf Water (DSW) depends on their surface vertical resolution Deeper surface cells shift the direction of surface Ekman...

We figured out a cheap-ish way to make ocean models create Dense Shelf Waters (DSW) on the surface of the Antarctic continental shelf! How?
Fast answer: Ocean surface cells thinner than 1 m!
Long answer on the paper: dx.doi.org/10.1029/2024...
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More info in the thread

Constraining local ocean dynamic sea-level projections using observations Abstract. The redistribution of ocean water volume under ocean–atmosphere dynamical processes results in sea-level changes. This process, called ocean dynamic sea level (ODSL) change, is expected to b...

We are now thinking about generalising this method to the whole world so it can be used for the next IPCC projections and help coastal decision makers around the world rather than only along the Dutch coast.
os.copernicus.org/articles/21/...

Depending on the answer to this question more or less models are selected to make projections. We present different selection options and discuss how they relate to the needs of users of sea-level scenarios.

Then there is the usual tough question: how much of what we observe is forced by climate change and how much is natural variability?

We therefore decided to select models that perform well in the past. This is not straight forward because sea-level change is measured with tide gauges and satellite altimeters but ocean dynamic sea-level change is only a part of total sea level and it can't be measured directly.

We looked at "ocean dynamic sea-level change", a difficult process pushing sea level up or down depending on the regions, as a result of changes in the ocean circulation. In the models, changes in dynamic sea-level in the past 30 years is correlated with the change during the 21st century.

However, we touch on important questions for climate projections in general:
- How can we assess if climate models are fit for the purpose of making projections?
- If they are not yet good enough what do we do?

We have a new paper out in Ocean Science together with Iris Keizer and Sybren Drijfhout:
os.copernicus.org/articles/21/...

This work was part of the development of new climate scenarios for the Netherlands so we focused on the Dutch coast:
cdn.knmi.nl/system/ckedi...

Mechanical Watch – Bartosz Ciechanowski Interactive article explaining how a mechanical watch works.

Was chatting to one of my most brilliant Physics students yesterday and he had no idea how mechanical watches work and was fascinated by the fact that they make use of such basic Physics principles and the history of how watchmakers have overcome various limitations on accuracy. Shared this with him

met dank aan de intensieve veehouderij! 🐷🐄🐔

"Blauwalg ontstaat meestal in warm, stilstaand water dat rijk is aan voedingsstoffen zoals fosfor en stikstof."

bron: alles-over-water.nl

Increase in methane emissions from fossil fuels has been underestimated. Our new PNAS paper just published today:
www.pnas.org/doi/epub/10....

Attenborough’s Ocean is the film I’ve been waiting my whole career for – now the world must act on its message | George Monbiot The documentary shows the damage that fishing does to our planet. So why does the industry still hold governments to ransom? asks Guardian columnist George Monbiot

The plunder of our seas by industrial fishing is a monstrosity in which almost everyone unwittingly collaborates. For decades this truth has been deliberately hidden from us. Now at last the consensus is cracking.
This week's column.
www.theguardian.com/commentisfre...

Big octopus catch by Newlyn boat 'does fishing industry a favour' Crew members of a Cornwall beam trawler celebrate after the huge catch adds to a haul worth £158k.

Ecologically illiterate, cruel and self-serving industry propaganda, channelled uncritically by the BBC. So much for informed reporting. So much for impartiality. www.bbc.co.uk/news/article...

Merci à @france3centre.bsky.social pour cette émission "dimanche en politique" sur un sujet tout particulièrement politique: le changement climatique.
www.france.tv/7131284-null...