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Jean-Pascal van Ypersele

@jpvanypersele

IPCC Vice-Chair for AR5, climate physicist, convinced that we can improve the well-being of all those who need it. Science, justice, empathy, sustainability without greenwashing, gender equality, listening to youth🌍🔭

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25.02.2024
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Latest posts by Jean-Pascal van Ypersele @jpvanypersele

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My commentary on the US withdrawal from the IPCC
and the Framework Convention on Climate Change

The withdrawal of the United States from the IPCC (Intergovernmental Panel on Climate
Change) (and the Climate Convention) is deeply regrettable. It is... (see below) #IPCC #Climate #UNFCCC

08.01.2026 12:14 👍 7 🔁 5 💬 1 📌 0
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Threatening NCAR, Trump administration seeks to extinguish a beacon of climate science The Trump administration’s world view is that the US doesn’t need a climate science brain trust because it doesn’t like what the brains say.

Threatening NCAR, Trump administration seeks to extinguish a beacon of climate science (by Ben Santer) thebulletin.org/?p=128171 via @BulletinAtomic #AttackOnScience

20.12.2025 08:31 👍 3 🔁 2 💬 1 📌 1
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Aux États-Unis, l’Administration Trump veut abattre un «pilier» des sciences du climat L’administration américaine entend démanteler le Centre national de recherche atmosphérique de Boulder, dans le Colorado, une référence mondiale, au prétexte qu’elle est «alarmiste».

Fondé en 1960 aux pieds des Rocheuses, le NCAR, financé par le gouvernement fédéral et géré par un consortium d’universités, est une véritable institution, que ce soit pour les prévisions météo locales ou la modélisation de climat au niveau mondial. www.lefigaro.fr/sciences/aux...

19.12.2025 15:26 👍 1 🔁 1 💬 0 📌 0

The Trump attack on US National Center for Atmospheric Research @ncar-ucar.bsky.social is an attack on human intelligence. If Trump persists it will soon discover that weather and climate share exactly the same physical laws. Shutting off NCAR would hurt the US economy and security #AttackOnScience

20.12.2025 09:06 👍 1 🔁 0 💬 0 📌 0

@ncar-ucar.bsky.social

20.12.2025 08:39 👍 0 🔁 0 💬 0 📌 0
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Threatening NCAR, Trump administration seeks to extinguish a beacon of climate science The Trump administration’s world view is that the US doesn’t need a climate science brain trust because it doesn’t like what the brains say.

Threatening NCAR, Trump administration seeks to extinguish a beacon of climate science (by Ben Santer) thebulletin.org/?p=128171 via @BulletinAtomic #AttackOnScience

20.12.2025 08:31 👍 3 🔁 2 💬 1 📌 1

« The National Oceanic and Atmospheric Administration (NOAA) plays a vital role in the United States' ability to anticipate and respond to short- and long-term threats to security, health, and resilience. » This vital role is under threat. Please read👇

21.06.2025 01:49 👍 28 🔁 7 💬 2 📌 1
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La science du climat à l’épreuve | OHdio | Radio-Canada Écoutez l’extrait de l’émission Tout terrain : La science du climat à l’épreuve

Les États-Unis font la guerre à la science du climat.

« C’est une tentative de mise en cause de la solidité scientifique du lien entre ce réchauffement et les émissions de gaz à effet de serre », dit @jpvanypersele.bsky.social ‬ ancien vice-président du GIEC

ici.radio-canada.ca/ohdio/premie...

10.08.2025 16:39 👍 6 🔁 3 💬 0 📌 0
Opportunités de carrière : Postdoctoral position in postgrowth climate mitigation modelling focused on food, biomass, land-use (22432)

🥳🚨🤩 Job opportunity with me at Uni Lausanne working on the REAL project!

2 year Postdoctoral position in postgrowth climate mitigation modelling focused on food, biomass, land-use

Link here for details and application. Deadline 15 Sept!
tinyurl.com/33rfw3xz

15.08.2025 08:53 👍 40 🔁 23 💬 2 📌 0
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Donald Trump’s war on climate science has staggering implications Even a policy of “drill, baby, drill” would imply more climate research, not its evisceration, says Ralph Keeling

Ralph Keeling in The Economist

www.economist.com/by-invitatio...

07.08.2025 12:35 👍 62 🔁 25 💬 0 📌 2
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The famines in Gaza and other conflict areas are a moral failure As scientists and members of the Standing Together for Nutrition Consortium (ST4N) who have been Standing Together For Nutrition during recent crises, we use evidence of the impact of crises on nutrit...

We members of the Standing Together for Nutrition Consortium raise our voices against the intentional deprivation of food and aid in Gaza, and in other countries, including Sudan, South Sudan, and Yemen. The Lancet commentary: shorturl.at/oGYqA. ST4N call to action: shorturl.at/Jssyb

30.07.2025 23:03 👍 14 🔁 5 💬 0 📌 0
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Offre d’emploi dans mon équipe de la Plate-forme wallonne pour le #GIEC. Date limite: 21 juillet minuit.

03.07.2025 10:12 👍 4 🔁 1 💬 3 📌 0

Today! #ShowYourStripes

21.06.2025 02:59 👍 12 🔁 2 💬 1 📌 0

« The National Oceanic and Atmospheric Administration (NOAA) plays a vital role in the United States' ability to anticipate and respond to short- and long-term threats to security, health, and resilience. » This vital role is under threat. Please read👇

21.06.2025 01:49 👍 28 🔁 7 💬 2 📌 1
Europe : La canicule n'attend même plus l'été
Europe : La canicule n'attend même plus l'été YouTube video by TV5MONDE Info

J’étais invité ce soir dans le grand JT de 18h de @TV5MONDE. On y a parlé canicule, objectif de 1.5°C et ce que l’on peut faire (citoyens, gouvernements, acteurs économiques) pour limiter les dégâts. Rediffusion:
m.youtube.com/watch?v=YIuP...
#UrgenceClimatique

20.06.2025 21:51 👍 14 🔁 4 💬 1 📌 0

Shocking! Evicting this very important climate lab from its New York office is the latest act of war against science by the Trump administration. Ultimately, no economy can flourish while neglecting science. This is barbarian. Full solidarity with all GISS personnel! #WarAgainstScience

01.06.2025 07:13 👍 11 🔁 2 💬 1 📌 0

This should be in top media headlines everywhere. Humanity clearly moves in the wrong direction: adding more and more thermal insulation around the planet, which is already too warm! It is urgent to decarbonise our economies and ways of life. #ClimateEmergency

10.06.2025 04:31 👍 27 🔁 21 💬 1 📌 1

This should be in top media headlines everywhere. Humanity clearly moves in the wrong direction: adding more and more thermal insulation around the planet, which is already too warm! It is urgent to decarbonise our economies and ways of life. #ClimateEmergency

10.06.2025 04:31 👍 27 🔁 21 💬 1 📌 1
Graph showing daily, weekly and monthly values for the past 13 months. Concentration now near its seasonal high.

Graph showing daily, weekly and monthly values for the past 13 months. Concentration now near its seasonal high.

Based on daily values, the May average of atmospheric CO₂ at Mauna Loa was ~430.5 ppm; that's 3.6 ppm higher than last year, a big jump again!
#co2 #climatechange #globalwarming

01.06.2025 15:05 👍 25 🔁 24 💬 3 📌 0

La guerre de Trump contre les sciences du climat. Article à relire alors que le GISS, l’un des principaux centres de recherche mondiaux sur le climat, vient d’être expulsé de ses bureaux 👇#WarAgainstScience

01.06.2025 07:41 👍 9 🔁 2 💬 1 📌 0

Governments of rich countries need to understand that investing money in climate action today will cost much less over time than waiting for the bill that Nature will send us if we continue to mistreat her.
COP30 in Bélem will need to deliver much more.

24.11.2024 12:20 👍 20 🔁 11 💬 1 📌 0
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Trump Has Cut Science Funding to Its Lowest Level in Decades The lag in funding extends far beyond D.E.I. initiatives, affecting almost every area of science: chemistry, computing, engineering, materials and more.

Trump Has Cut Science Funding to Its Lowest Level in Decades www.nytimes.com/interactive/...

22.05.2025 14:16 👍 383 🔁 185 💬 19 📌 25
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As of today, Elon Musk is thought to be responsible for the death of 300,000 adults and kids due to the illegal closure of USAID (source: www.impactcounter.com/dashboard?vi...)

That's a 103 deaths per hour, each day. And it will get worse.

His legacy is one of death, destruction, and failure.

30.05.2025 01:57 👍 4061 🔁 1595 💬 107 📌 80

Shocking! Evicting this very important climate lab from its New York office is the latest act of war against science by the Trump administration. Ultimately, no economy can flourish while neglecting science. This is barbarian. Full solidarity with all GISS personnel! #WarAgainstScience

01.06.2025 07:13 👍 11 🔁 2 💬 1 📌 0
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Swiss village almost entirely destroyed after collapse of glacier buries it in mud One person missing and Blatten devastated after huge cloud of ice and rubble inundates evacuated town

Thankfully, the village was evacuated already, but one person is missing and everyone else’s homes are destroyed.

Make no mistake: this is a climate disaster.

29.05.2025 01:23 👍 1539 🔁 622 💬 38 📌 56
Graph of CO2 concentrations for the past 800,000 years from the Antarctic ice cores, showing current CO2 levels of 430 ppm are far, far higher than any level over this period, which never exceeded 300 ppm. Also shown is the emergence of Homo sapiens around 200,000 years ago -- so CO2 levels are higher than we've ever experienced.

Graph of CO2 concentrations for the past 800,000 years from the Antarctic ice cores, showing current CO2 levels of 430 ppm are far, far higher than any level over this period, which never exceeded 300 ppm. Also shown is the emergence of Homo sapiens around 200,000 years ago -- so CO2 levels are higher than we've ever experienced.

You are here.
We've breached 430 ppm CO2.
#climatechange

22.04.2025 23:09 👍 815 🔁 365 💬 39 📌 31
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"Griezelige tijden": meteoroloog Tom moest vertrekken bij 'KMI van VS' en waarschuwt voor wereldwijde gevolgen van ontslaggolf

Collega Marie Wagemans en ik spraken met @tdiliberto.bsky.social, een van de meer dan 1000 ontslagen personeelsleden van de Amerikaanse atmosfeerdienst NOAA. Hun werk is onmisbaar voor de wereldwijde klimaatwetenschap. @jpvanypersele.bsky.social

www.vrt.be/vrtnws/nl/20...

05.04.2025 07:22 👍 13 🔁 5 💬 0 📌 0

C'est dur parce que ça tape proche. Mon Alma mater messieurs dames :

08.12.2024 05:43 👍 11 🔁 5 💬 2 📌 0
Entretien avec le Professeur Jean-Pascal van YPERSELE La COP 29 aura lieu en Azerbaïdjan du 11 au 22 novembre. A cette occasion l'équipe d'Eco Radio vous propose une série de podcast sur le thème des changements climatique. Pour en savoir plus sur les ch...

En amont de la COP29, des collégiens ont interviewé le climatologue et ancien vice-président du GIEC
@jpvanypersele.bsky.social .

📻 sites.ac-nancy-metz.fr/eco-radio/in...

(8/10)

06.12.2024 12:26 👍 1 🔁 1 💬 1 📌 0

Aux négociateurs de l'Arizona : Investir dans la Coopération Au Développement, c'est préparer un monde plus juste, solidaire et durable ! @jpvanypersele.bsky.social

31.01.2025 09:49 👍 6 🔁 1 💬 0 📌 0