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Pierre Friedlingstein

@pfriedling.bsky.social

8.2K followers 420 following 430 posts

Born at 321 ppm. Climate & Carbon Cycle Scientist. Prof @UniofExeter Directeur de Recherche @CNRS @GlobalCarbonProject

Pierre Friedlingstein is Professor and Chair in Mathematical Modelling of the Climate System at the University of Exeter, and Research Director at the Laboratoire de Météorologie dynamique (LMD), Centre National de la Recherche Scientifique (CNRS), France. .. more

Environmental science 58%

Geography 17%

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Pierre Friedlingstein @pfriedling.bsky.social · Nov 13

Really sorry for the poor quality of the figures below. They looked OK on my laptop

All figures are available here:
globalcarbonbudget.org/gcb-2024/
GCB Presentation in PDF and PPT format
plus country level emission figures
Also available here :
robbieandrew.github.io/GCB2024/

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Pierre Friedlingstein @pfriedling.bsky.social · 8h

👏

Dr. Genevieve Guenther (she/they) @doctorvive.bsky.social · 11h

The attack on @frediotto.bsky.social was seeded years ago by Roger Pielke Jr, who started arguing that this table from a recent @ipcc.bsky.social report proved that climate science cannot attribute extreme weather to climate change.

But Roger is of course lying. And we know this for 2 reasons.

🧵

CLIMATEWIRE
Climate critics try to discredit IPCC author for linking
disasters to global warming
By LESLEY CLARK, SARA SCHONHARDT, CHELSEA HARVEY | 10/09/2025
06:22 AM EDT Roger Pielke Jr. and oil industry supporters are attacking climate scientist Friederike Otto, whose
work has been used in lawsuits against polluters.

Table 12.12 | Emergence of CIDs in different time periods, as assessed in this section. The colour contesponds to the confidence of the region with the highest confidence: white cells indicate where evidence is lacking or the signal is not present, leading to overal bu confidence of an emerging signal.

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Reposted by Pierre Friedlingstein, Peter Thorne, Michael Wehner , and 1 more Pierre Friedlingstein, Peter Thorne, Michael Wehner, Flavio Lehner

Dr. Genevieve Guenther (she/they) @doctorvive.bsky.social · 11h

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Pierre Friedlingstein @pfriedling.bsky.social · 20h

If you can’t refute the message, attack the messenger !
🤬

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Pierre Friedlingstein @pfriedling.bsky.social · 3d

I hope he doesn’t mean his last sentence…

Pierre Friedlingstein @pfriedling.bsky.social · 4d

CCS can only reduces emissions, with CO₂ being captured before being released to the atmosphere and then stored underground.
To remove CO₂ from the atmosphere one needs CDR (such as DAC, afforestation, BECCS, …).

Pierre Friedlingstein @pfriedling.bsky.social · 4d

Definitely worth a read.

Dr. Jonathan Foley @globalecoguy.bsky.social · 4d

The jig is up for CCS and DAC.

oilprice.com/Energy/Energ...

The Collapse of Confidence in Carbon Capture | OilPrice.com

Carbon Capture and Storage, once seen as a lifeline for the oil and gas industry, is facing mounting doubts as delays, high costs, and poor performance cast serious doubts on its future viability.

oilprice.com

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Reposted by Pierre Friedlingstein, Wolfgang Crämer, Peter Jacobs

Dr. Jonathan Foley @globalecoguy.bsky.social · 4d

The jig is up for CCS and DAC.

oilprice.com/Energy/Energ...

The Collapse of Confidence in Carbon Capture | OilPrice.com

Carbon Capture and Storage, once seen as a lifeline for the oil and gas industry, is facing mounting doubts as delays, high costs, and poor performance cast serious doubts on its future viability.

oilprice.com

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Pierre Friedlingstein @pfriedling.bsky.social · 6d

Light by a long way. Not that many people still use candles! 😉

Pierre Friedlingstein @pfriedling.bsky.social · 10d

A bit saddening that speaking the truth about science is now seen as potentially incompatible with being non partisan…

But you are making the right choice. Pretty much any one could be a provost but only Michael Mann can be Michael Mann 😉

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Pierre Friedlingstein @pfriedling.bsky.social · 17d

It is difficult to get a man to understand something when his salary depends upon his not understanding it.
(Upton Sinclair)

www.reuters.com/sustainabili...

Trump tells UN that climate change is a 'con job'

President Donald Trump dismissed climate change as “the greatest con job” in the world during his address to the United Nations General Assembly on Tuesday, doubling down on his skepticism of global environmental initiatives and multilateral institutions.

www.reuters.com

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Pierre Friedlingstein @pfriedling.bsky.social · 18d

Yep I fully agree Ben.
Given the current political landscape across the world, the idea of a responsible global governance on SRM is extremely naive.

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Pierre Friedlingstein @pfriedling.bsky.social · 19d

En comparaison avec une marée noire suite au naufrage d’un pétrolier, y a pas photo 😉

Pierre Friedlingstein @pfriedling.bsky.social · 23d

How about speeding up the phase-out of fossil fuel?
Period.

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 10

That probably won’t ever happen in our life time, so CO₂ forcing will probably always dominate.

Pierre Friedlingstein @pfriedling.bsky.social · Sep 10

I agree with Michael here. Current CO₂ induced warming is about 50% larger than CH₄.
For current CH₄ emissions, atmospheric CO₂ should drop significantly below 400ppm. That won’t happen in the coming decades.

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Il faut réduire les émissions de bcp plus que ça et de manière soutenue pendant des années pour voir un signal sur le CO₂ atmosphérique qui sort du bruit.

Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Du coup -6% d’émission anthropique, 35 au lieu de 37 GtCO₂ émis par l’homme induirait une baisse du taux de croissance du CO₂ d’environ 0.1ppm. Bien inférieur à la variabilité naturelle, donc indétectable.

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

La variabilité d’une année à l’autre est entièrement due aux puits biosphériques, et à leur réponse à la variabilité du climat : El Nino = puits plus faibles = taux de croissance plus élevé.
Rien à voir avec les émissions anthropiques qui varient très peu d’une année à l’autre

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Vous avez entendu parlé de la variabilité interannuelle du climat et du cycle du carbone ?
Regardez ce graphe qui montre le taux de croissance annuel du CO₂.

gml.noaa.gov/webdata/ccgg...

gml.noaa.gov

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

C’est vous qui avez parlé de net zéro (=réduction de 100%)…
Net zéro est clairement pas trivial mais pas impossible.

Apres si on émet deux fois moins de CO₂ le réchauffement est réduit d’autant. Actuellement on est à 0.25C/décennie.
Passer à 0.1C serait un grand pas dans la bonne direction

Reposted by Pierre Friedlingstein

CNRS @cnrs.fr · Sep 9

To rehabilitate the general view of women's contributions to the history of science, the CNRS is part of a commission that aims to inscribe the names of 72 female scientists on the Eiffel Tower. 🗼 #WomenInScience

Women scientists to be showcased on the Eiffel Tower soon

To rehabilitate the general view of women's contributions to the history of science, the CNRS is part of a commission that aims to inscribe

www.cnrs.fr

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Lisez les publications du Global Carbon Budget ca vous aidera à comprendre le cycle du carbone 😉

La dernière en date :

essd.copernicus.org/articles/17/...

Global Carbon Budget 2024

Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to bette...

essd.copernicus.org

Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Quand au Covid, comme déjà répondu, les émissions anthropiques n’ont diminué que de 6% en 2020 (35 vs 37 milliards de tonnes de CO₂). Pas assez pour avoir un impact quelconque,en un an, sur le CO₂ atmosphérique ou la température globale.

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Non le réchauffement s’arrête (plus on moins ~10%) quand les émissions de CO₂ s’arrêtent. Si les émissions anthropiques s’arrêtent, la concentration de CO₂ diminue de qui compense l’inertie thermique du système climatique.
Il y a pas mal de papiers scientifiques qui ont montré ca depuis 10-15 ans.

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 9

Globalement le réchauffement s’arrête quand les émissions s’arrêtent.
Mais en effet tant qu’on continue à émettre des gaz à effet de serre (même en quantité décroissante), la température continuera à augmenter.
Mais limiter le réchauffement sous 2C est encore possible.

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Reposted by Valerie M. Delmotte, Pierre Friedlingstein, Matthias Cuntz , and 1 more Valerie M. Delmotte, Pierre Friedlingstein, Matthias Cuntz, Céline Guivarch

Haut conseil pour le climat @hc-climat.bsky.social · Sep 5

🌍 Un engagement ambitieux de l’Europe pour 2040 est indispensable pour maintenir vivants les objectifs de l’Accord de Paris.
La position de la France fait peser un risque important sur l’adoption par l'UE d’objectifs à la mesure du défi climatique.
➡️ www.hautconseilclimat.fr/actualites/o...

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 […]

www.hautconseilclimat.fr

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 5

Je confirme, Fressoz est un hurluberlu!

Pierre Friedlingstein @pfriedling.bsky.social · Sep 4

It was a tongue in cheek comment. Not suggesting that reach 2.2 then reverse is the best strategy 😉

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Pierre Friedlingstein @pfriedling.bsky.social · Sep 3

😀. Indeed. Probably not going to work for sea level rise (or many other largely irreversible changes) …

Reposted by Richard Betts

Pierre Friedlingstein @pfriedling.bsky.social · Sep 3

A 0.7°C cooling at best from all geological carbon storage.
So could 2.2°C be seen as the maximum allowed overshoot temperature ? 🤓

Joeri Rogelj @joerirogelj.bsky.social · Sep 3

NEW STUDY: How much CO2 can we safely store in geological formations?

In a new @nature.com study, we cross-check established academic and industry estimates with various risk factors.

We find a prudent geological CO2 storage limit that is about 10x smaller. /1

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