Pierre Friedlingstein
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pfriedling.bsky.social
Pierre Friedlingstein
@pfriedling.bsky.social
8.3K followers 440 following 530 posts

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

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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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pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
Published today in Earth System Science Data: The Global Carbon Budget 2025
essd.copernicus.org/preprints/es...
Global Carbon Budget 2025
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

Reposted by Pierre Friedlingstein, Iain Davidson, Christopher Wright , and 4 more

drkatemarvel.bsky.social
Kate Marvel @drkatemarvel.bsky.social · 14h
I really wish we'd stop calling them climate "skeptics" or "vaccine skeptics", if you jump off a cliff we don't call you a "gravity skeptic"

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 15h
bsky.app/profile/pfri...
pfriedling.bsky.social Pierre Friedlingstein @pfriedling.bsky.social · 12d
2023-2024 El Niño led to a record high atmospheric CO₂ increase of 29 GtCO2 in 2024 (3.7 ppm), almost 50% above the decadal average.
The land sink decreased substantially, 20% below the decadal average, 40% below 2022 (pre-El Niño). The tropics recorded the largest drop in the land C sink
2024 anomaly of the land sink

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 15h
Last year record increase in atmospheric CO₂ (3.7ppm), well above the decadal average of about 2.5 ppm, was due to the El Niño conditions.

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 15h
That statement is misleading:
…” the concentration of carbon in Earth’s atmosphere rose more in 2024 than in any other year ..”
“Climate scientists unanimously agree that last year’s increase was provoked by human activities, especially the burning of fossil fuels like oil, coal and natural gas.”

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 15h
For once, some good news about the Amazon tropical forest 🌳

www.nature.com/articles/s41...
Increasing tree size across Amazonia - Nature Plants
A global research network monitoring the Amazon for 30 years reports in this study that tree size increased by 3% each decade.
www.nature.com

Reposted by Pierre Friedlingstein

esm2025.bsky.social
ESM2025 @esm2025.bsky.social · 1d
Eager for more details?
👀 Check our full Research Highlight here:bit.ly/4qMYPEy

With @docaharper.bsky.social from @universityofga.bsky.social @exeter.ac.uk, Gabriel Abrahão, from @pik-potsdam.bsky.social and @rosieafisher.bsky.social, from @cicero.oslo.no
Can We Count on the Land? Exploring the Uncertainty of Land-based Mitigation Strategies
How Earth System Models assess land-based carbon removal (AR, BECCS): carbon-cycle responses, and local climate side-effects; and how Integrated Assessment Models then asses socio-economic constraints that shape decision-ready deployment.
www.esm2025.eu

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 4d
👏
rishpardikar.bsky.social Rishika Pardikar @rishpardikar.bsky.social · 7d
At #COP30 last week, India highlighted the impossibility of 1.5C and the reliance on CDR for overshoot scenarios. Interview with @glenpeters.bsky.social about Paris Agreement temperature goals, where we need to go and how to get there.

drilled.media/news/cop30-g...
A Reckoning with the 1.5°C Goal at COP30
Climate scientist Glen Peters about where we are in terms of achieving Paris Agreement temperature goals, where we need to go and how to get there.
drilled.media

Reposted by Glen P. Peters, Pierre Friedlingstein

rishpardikar.bsky.social
Rishika Pardikar @rishpardikar.bsky.social · 7d
At #COP30 last week, India highlighted the impossibility of 1.5C and the reliance on CDR for overshoot scenarios. Interview with @glenpeters.bsky.social about Paris Agreement temperature goals, where we need to go and how to get there.

drilled.media/news/cop30-g...
A Reckoning with the 1.5°C Goal at COP30
Climate scientist Glen Peters about where we are in terms of achieving Paris Agreement temperature goals, where we need to go and how to get there.
drilled.media

Reposted by Tom Shakespeare

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 7d
👏
“When it comes to climate change, the “end of the world” and “good for you” are “the two lowest-probability outcomes”.

www.nature.com/articles/d41...
Bill Gates’s climate comments are a dangerous distraction
People do not have to dismiss or exaggerate the climate threat to justify concerted action.
www.nature.com

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 9d
Très bel entretien 👍

Reposted by Pierre Friedlingstein, Juan Cole

michaelemann.bsky.social
Michael E. Mann @michaelemann.bsky.social · 10d
Direct air capture is not currently viable strategy. Likely increases carbon pollution (more carbon energy required to than saved). See @mzjacobson.bsky.social's work: news.stanford.edu/stories/2019... & Joe Romm's review for our center (@penncssm.bsky.social): bpb-us-w2.wpmucdn.com/web.sas.upen...
Study casts doubt on carbon capture
Current approaches to carbon capture can increase air pollution and are not efficient at reducing carbon in the atmosphere, according to research from Mark Z. Jacobson.
news.stanford.edu

Reposted by Pierre Friedlingstein

audreygarric.bsky.social
Audrey Garric @audreygarric.bsky.social · 10d
Au GIEC, une bataille très politique autour des dates de publication du prochain rapport d’évaluation. Pour la 4e fois en 2 ans, les pays n’ont pas réussi à s’accorder sur son calendrier. Certains pays veulent repousser sa parution pour amoindrir l’action climatique www.lemonde.fr/planete/arti...
Au GIEC, une bataille très politique autour des dates de publication du prochain rapport d’évaluation
Pour la quatrième fois en deux ans, les pays n’ont pas réussi à s’accorder sur le calendrier du rapport phare du groupe d’experts du climat. Certains pays veulent repousser sa parution pour amoindrir ...
www.lemonde.fr

Reposted by Pierre Friedlingstein, Richard Waite

ourworldindata.org
Our World in Data @ourworldindata.org · 11d
How much CO₂ can the world emit while limiting global temperature rise?
Bar chart showing estimates of remaining carbon dioxide budgets that give a 50% likelihood of staying below each temperature level, relative to pre-industrial levels. A baseline label shows global emissions in 2025 at 42 gigatonnes (Gt) per year. Three vertical bars show remaining CO2 budgets: stay below 1.5°C — 170 Gt, labeled as 4 years of current emissions, with a note that if emissions stay at 2025 levels the 1.5°C budget will be exhausted within 4 years; stay below 1.7°C — 525 Gt, labeled as 12.5 years of current emissions; stay below 2°C — 1055 Gt, labeled as 25 years of current emissions, with an annotation saying that by 2050 we will have exhausted the 2°C budget unless emissions are reduced now. Footer note states these estimates have uncertainty and depend on changes in non-CO2 greenhouse gases such as methane and nitrous oxide. Data sources listed as IPCC, Forster et al. (2025) and Global Carbon Project (2025). License CC BY.

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 11d
You could also mention that the projected atmospheric CO₂ growth rate will be much lower in 2025 (2.6ppm, red dot on the figure).

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 11d
bsky.app/profile/pfri...

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 11d
You are confusing CO₂ emissions and CO₂ concentrations.

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 11d
And thank you for your contribution 🙏

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
theconversation.com/the-worlds-c...
The world’s carbon emissions continue to rise. But 35 countries show progress in cutting carbon
In 2025 the world has fallen short, again, of peaking and reducing its fossil fuel use. But there are many countries on a path to greener energy.
theconversation.com

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
ourworldindata.org/explorers/co2

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
www.sustainabilitybynumbers.com/p/global-car...

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
www.carbonbrief.org/analysis-fos...

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
@hausfath.bsky.social
bsky.app/profile/haus...

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
Other posts/additional resources

Additional resources:

@glenpeters
bsky.app/profile/glen...

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
More figures, data, etc on the GCB website:
globalcarbonbudget.org
Home
The critical annual update revealing the latest trends in global carbon emissions
globalcarbonbudget.org

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
Keeping warming well below 2°C is still within reach, but with massive acceleration of emission mitigation.
It’s time to step up, not to give up.
Net zero trajectories

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
The remaining carbon budget for 1.7°C or 2°C is 525 GtCO2 and 1055 GtCO2 respectively, equivalent to 12 and 25 years of current CO₂ emissions.

Reposted by Wim Thiery, Clark Gray

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
Time is up for 1.5°C. The remaining carbon budget for 1.5°C is virtually exhausted: 170 GtCO2, equivalent to 4 years at the 2025 emissions levels.
Remaining carbon budget charts

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
Last, we update the remaining carbon budget, that is the amount of CO₂ humanity can still emit in the future while limiting global warming to 1.5°C , 1.7°C or 2°C.

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
Since 1960, that climate impact leads to a loss of carbon from land and ocean (relative to what they would have been without climate change). We attribute that 8ppm (8%) of the observed atmospheric CO₂ increase of 100 ppm since 1960 is due to this weakening of the sinks.
climate impact on the sinks and on atmospheric CO₂

pfriedling.bsky.social
Pierre Friedlingstein @pfriedling.bsky.social · 12d
We also analysed the effect of climate change on the sinks using our models separating the effect of increased atmospheric CO₂, from the effect of climate change.
Result: The land and ocean sinks would have been 25% and 7% larger in the absence of climate change.
effect of climate change on teh land and ocean sinks