En 1990, il y a 36 ans, mes collègues du GIEC ont publié : « Le changement climatique pourrait entraîner une augmentation de la fréquence des phénomènes météorologiques extrêmes ... L'assèchement de certaines régions pourrait entraîner une augmentation de la fréquence des incendies. … »
July 28, 2026 at 1:16 PM
En 1990, il y a 36 ans, mes collègues du GIEC ont publié : « Le changement climatique pourrait entraîner une augmentation de la fréquence des phénomènes météorologiques extrêmes ... L'assèchement de certaines régions pourrait entraîner une augmentation de la fréquence des incendies. … »
AR7 = Seventh Assessment Report, composed of three “working groups” or volumes as follows ⬇️
WG1: physical science basis
WG2: impacts, adaptation and vulnerability
WG3: mitigation
WG1: physical science basis
WG2: impacts, adaptation and vulnerability
WG3: mitigation
February 21, 2025 at 3:06 AM
AR7 = Seventh Assessment Report, composed of three “working groups” or volumes as follows ⬇️
WG1: physical science basis
WG2: impacts, adaptation and vulnerability
WG3: mitigation
WG1: physical science basis
WG2: impacts, adaptation and vulnerability
WG3: mitigation
Looking forward to a 4th term an IPCC Lead Author! I've dotted around a bit over the years:
AR4 - WG1 Radiative Forcing (focussing on land use)
AR5 - WG2 Terrestrial Ecosystems
AR6 - WG2 Water
AR7 - WG1 Global Projections
Always fantastic to work with international colleagues and learn from them
AR4 - WG1 Radiative Forcing (focussing on land use)
AR5 - WG2 Terrestrial Ecosystems
AR6 - WG2 Water
AR7 - WG1 Global Projections
Always fantastic to work with international colleagues and learn from them
Three University of Exeter scientists have been appointed as authors for the Intergovernmental Panel on Climate Change (IPCC) Seventh Assessment Report
Read more here 👇
Read more here 👇
Three Exeter experts appointed for new IPCC report
Three University of Exeter scientists have been appointed as authors for the Intergovernmental Panel on Climate Change (IPCC) Seventh Assessment Report. The IPCC is the United Nations body for assessing the science related to climate
news.exeter.ac.uk
September 8, 2025 at 7:37 PM
Looking forward to a 4th term an IPCC Lead Author! I've dotted around a bit over the years:
AR4 - WG1 Radiative Forcing (focussing on land use)
AR5 - WG2 Terrestrial Ecosystems
AR6 - WG2 Water
AR7 - WG1 Global Projections
Always fantastic to work with international colleagues and learn from them
AR4 - WG1 Radiative Forcing (focussing on land use)
AR5 - WG2 Terrestrial Ecosystems
AR6 - WG2 Water
AR7 - WG1 Global Projections
Always fantastic to work with international colleagues and learn from them
Nice schematic showing how a warmer climate increases not only the probability of extreme events, but also the intensity of extreme events with the same probability as the pre-Industrial climate. [From AR6 WG1 Ch11]
December 16, 2024 at 3:27 AM
Nice schematic showing how a warmer climate increases not only the probability of extreme events, but also the intensity of extreme events with the same probability as the pre-Industrial climate. [From AR6 WG1 Ch11]
🥵 Europe has been affected by a terrible heatwave, with impacts across the continent & record-breaking temperatures in many countries. The @ipcc.bsky.social #AR6 conclusions show that that heat extremes have become more intense & more frequent across the world due to human-induced climate change.
June 28, 2026 at 6:19 PM
🥵 Europe has been affected by a terrible heatwave, with impacts across the continent & record-breaking temperatures in many countries. The @ipcc.bsky.social #AR6 conclusions show that that heat extremes have become more intense & more frequent across the world due to human-induced climate change.
Honoured to be selected as a lead author in the upcoming IPCC report chapter on scenarios and projected temperatures (AR7 WG1 Ch5) - looks like we'll have a great team!
For the complete list of authors, see apps.ipcc.ch/report/autho...
For the complete list of authors, see apps.ipcc.ch/report/autho...
August 18, 2025 at 11:05 AM
Honoured to be selected as a lead author in the upcoming IPCC report chapter on scenarios and projected temperatures (AR7 WG1 Ch5) - looks like we'll have a great team!
For the complete list of authors, see apps.ipcc.ch/report/autho...
For the complete list of authors, see apps.ipcc.ch/report/autho...
Predicting the future is hard, but climate models have a remarkably good record doing so (at least so far!), as we noted in the recent IPCC 6th Assessment report (WG1, chapter 1): www.ipcc.ch/report/a...
January 12, 2025 at 7:31 PM
Predicting the future is hard, but climate models have a remarkably good record doing so (at least so far!), as we noted in the recent IPCC 6th Assessment report (WG1, chapter 1): www.ipcc.ch/report/a...
For example:
Adding the invaluable figure WG1 SPM.2 to the AR6 WG1 Synthesis Report was "opposed by Saudi Arabia and India" in a huddle over this:
enb.iisd.org/58th-session...
Adding the invaluable figure WG1 SPM.2 to the AR6 WG1 Synthesis Report was "opposed by Saudi Arabia and India" in a huddle over this:
enb.iisd.org/58th-session...
July 4, 2025 at 3:25 PM
For example:
Adding the invaluable figure WG1 SPM.2 to the AR6 WG1 Synthesis Report was "opposed by Saudi Arabia and India" in a huddle over this:
enb.iisd.org/58th-session...
Adding the invaluable figure WG1 SPM.2 to the AR6 WG1 Synthesis Report was "opposed by Saudi Arabia and India" in a huddle over this:
enb.iisd.org/58th-session...
Correct diagram from IPCC, for reference
August 8, 2025 at 7:08 PM
Correct diagram from IPCC, for reference
I liked it so much I managed - somewhat against my expectations- to get it into the @ipcc.bsky.social ar6 wg1 chapter 2.
April 1, 2026 at 5:40 PM
I liked it so much I managed - somewhat against my expectations- to get it into the @ipcc.bsky.social ar6 wg1 chapter 2.
WG1, Chapter 9 reporting for duty 🫡
Very excited to participate in the next @ipcc.bsky.social Assessment Report, especially in a chapter with so many great colleagues and friends!
Very excited to participate in the next @ipcc.bsky.social Assessment Report, especially in a chapter with so many great colleagues and friends!
August 18, 2025 at 11:50 AM
WG1, Chapter 9 reporting for duty 🫡
Very excited to participate in the next @ipcc.bsky.social Assessment Report, especially in a chapter with so many great colleagues and friends!
Very excited to participate in the next @ipcc.bsky.social Assessment Report, especially in a chapter with so many great colleagues and friends!
Register jockey here. I once watched this play out in real time.
White Guy 1: hey man, how's it going?
White Guy 2: oh, you know, living the dream
WG1: you know that's White folk for I wish i were dead?
WG2: sure do, Bill. Sure do. Have a good one.
White Guy 1: hey man, how's it going?
White Guy 2: oh, you know, living the dream
WG1: you know that's White folk for I wish i were dead?
WG2: sure do, Bill. Sure do. Have a good one.
January 20, 2026 at 10:51 PM
Register jockey here. I once watched this play out in real time.
White Guy 1: hey man, how's it going?
White Guy 2: oh, you know, living the dream
WG1: you know that's White folk for I wish i were dead?
WG2: sure do, Bill. Sure do. Have a good one.
White Guy 1: hey man, how's it going?
White Guy 2: oh, you know, living the dream
WG1: you know that's White folk for I wish i were dead?
WG2: sure do, Bill. Sure do. Have a good one.
Airbnb : la Cour de cassation reconnaît que la plateforme est un éditeur ouvrant la voie à l’engagement de sa responsabilité en cas d’illégalité
➡️ https://l.humanite.fr/wG1
➡️ https://l.humanite.fr/wG1
January 9, 2026 at 4:15 PM
Airbnb : la Cour de cassation reconnaît que la plateforme est un éditeur ouvrant la voie à l’engagement de sa responsabilité en cas d’illégalité
➡️ https://l.humanite.fr/wG1
➡️ https://l.humanite.fr/wG1
This is an updated version of Figure 1.9 in the recent (2021) IPCC 6th Assessment Report Wg1, which in turn is based on my Hausfather et al. 2020 paper, available (open access) here: agupubs.onlinelibrar...
May 14, 2025 at 11:23 PM
This is an updated version of Figure 1.9 in the recent (2021) IPCC 6th Assessment Report Wg1, which in turn is based on my Hausfather et al. 2020 paper, available (open access) here: agupubs.onlinelibrar...
Registration now open for experts to review the next IPCC report, specifically WG1
📣 Registration is now open for experts to review the First Order Draft of the Working Group I contribution to IPCC’s Seventh Assessment Report.
Interested experts can register until 25 Sept 2026 🔗 https://bit.ly/4vi25cq
The review starts 10 August until 2 October.
More 🔗 https://bit.ly/WGI7Fod
Interested experts can register until 25 Sept 2026 🔗 https://bit.ly/4vi25cq
The review starts 10 August until 2 October.
More 🔗 https://bit.ly/WGI7Fod
August 4, 2026 at 9:20 AM
Registration now open for experts to review the next IPCC report, specifically WG1
kanon om kanon av karin www.aftonbladet.se/kultur/a/wg1...
Kulturkanon – men var fan är Hasse och Tage?
KARIN PETTERSSON Det vi fick var ett osorterat ordmoln
www.aftonbladet.se
September 2, 2025 at 11:07 AM
kanon om kanon av karin www.aftonbladet.se/kultur/a/wg1...
Rui Oliveira, WG1 lead and the local organizer for the meeting, discusses the WG1 aims, meeting overlook and goals.
April 1, 2025 at 8:52 AM
Rui Oliveira, WG1 lead and the local organizer for the meeting, discusses the WG1 aims, meeting overlook and goals.
The fact that in our lifetimes, global temperatures could reach higher than ever over the past 3,000,000 years is hard to comprehend.
The last glacial maximum, when sea levels were 134 m lower than today, was only 23,000 years ago.
Figure from the latest IPCC report (AR6 WG1, TS)
The last glacial maximum, when sea levels were 134 m lower than today, was only 23,000 years ago.
Figure from the latest IPCC report (AR6 WG1, TS)
September 27, 2025 at 3:34 PM
The fact that in our lifetimes, global temperatures could reach higher than ever over the past 3,000,000 years is hard to comprehend.
The last glacial maximum, when sea levels were 134 m lower than today, was only 23,000 years ago.
Figure from the latest IPCC report (AR6 WG1, TS)
The last glacial maximum, when sea levels were 134 m lower than today, was only 23,000 years ago.
Figure from the latest IPCC report (AR6 WG1, TS)
Honoured to be appointed Lead Author of IPCC #AR7 for the chapter 7 on "Projections of regional climate and extremes".
I am looking forward to contribute together with my @usyseth.bsky.social colleague @lukasgudmundsson.bsky.social
and IPCC WG1 vice-chair @soniaseneviratne.bsky.social
I am looking forward to contribute together with my @usyseth.bsky.social colleague @lukasgudmundsson.bsky.social
and IPCC WG1 vice-chair @soniaseneviratne.bsky.social
The #IPCC has announced the authors selected for its Seventh Assessment Report.
664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.
🌍 51% from developing countries
🚺 46% women
🔗 bit.ly/AR7AuthorsPR
664 experts from 111 countries have been invited to participate as Coordinating Lead Authors, Lead Authors, & Review Editors.
🌍 51% from developing countries
🚺 46% women
🔗 bit.ly/AR7AuthorsPR
August 18, 2025 at 3:19 PM
Honoured to be appointed Lead Author of IPCC #AR7 for the chapter 7 on "Projections of regional climate and extremes".
I am looking forward to contribute together with my @usyseth.bsky.social colleague @lukasgudmundsson.bsky.social
and IPCC WG1 vice-chair @soniaseneviratne.bsky.social
I am looking forward to contribute together with my @usyseth.bsky.social colleague @lukasgudmundsson.bsky.social
and IPCC WG1 vice-chair @soniaseneviratne.bsky.social
How long CO₂ lasts in the atmosphere largely depends on how much humanity keeps emitting, how much the world warms and how strong carbon-cycle feedbacks are and will be.
See IPCC AR6 WG1 feedbacks figure, Ts.17
3/
@ghostpanther.bsky.social
See IPCC AR6 WG1 feedbacks figure, Ts.17
3/
@ghostpanther.bsky.social
July 28, 2026 at 5:47 AM
How long CO₂ lasts in the atmosphere largely depends on how much humanity keeps emitting, how much the world warms and how strong carbon-cycle feedbacks are and will be.
See IPCC AR6 WG1 feedbacks figure, Ts.17
3/
@ghostpanther.bsky.social
See IPCC AR6 WG1 feedbacks figure, Ts.17
3/
@ghostpanther.bsky.social
This was already covered in the IPCC AR6 WG1 Climate Change 2021: The Physical Science Basis report (See fig 7.3), but has only gotten worse.
And this crucial indicator was ignored in the recent 'IPCC' indicator updates (Piers Forster et al. 2023 & 2024).
And this crucial indicator was ignored in the recent 'IPCC' indicator updates (Piers Forster et al. 2023 & 2024).
February 13, 2025 at 9:38 PM
This was already covered in the IPCC AR6 WG1 Climate Change 2021: The Physical Science Basis report (See fig 7.3), but has only gotten worse.
And this crucial indicator was ignored in the recent 'IPCC' indicator updates (Piers Forster et al. 2023 & 2024).
And this crucial indicator was ignored in the recent 'IPCC' indicator updates (Piers Forster et al. 2023 & 2024).
My graph is based on the IPCC AR6 WG1 feedbacks (see figure Ts.17)
Low (net) feedbacks lead to a high Climate Sensitivity. High feedbacks to a low Climate Sensitivity.
Low (net) feedbacks lead to a high Climate Sensitivity. High feedbacks to a low Climate Sensitivity.
February 13, 2025 at 9:38 PM
My graph is based on the IPCC AR6 WG1 feedbacks (see figure Ts.17)
Low (net) feedbacks lead to a high Climate Sensitivity. High feedbacks to a low Climate Sensitivity.
Low (net) feedbacks lead to a high Climate Sensitivity. High feedbacks to a low Climate Sensitivity.
Prof. @stijntvankessel.bsky.social (WG1 Leader) shared WG1's progress at the @eupoplink.bsky.social Conference.
Empasis on conceptual frameworks for studying populism and Euroscepticism accross Europe.
Empasis on conceptual frameworks for studying populism and Euroscepticism accross Europe.
August 25, 2025 at 9:43 AM
Prof. @stijntvankessel.bsky.social (WG1 Leader) shared WG1's progress at the @eupoplink.bsky.social Conference.
Empasis on conceptual frameworks for studying populism and Euroscepticism accross Europe.
Empasis on conceptual frameworks for studying populism and Euroscepticism accross Europe.
This data was already included in IPCC AR6 WG1 and should be included as a crucial climate indicator:
bsky.app/profile/leon...
bsky.app/profile/leon...
This was already covered in the IPCC AR6 WG1 Climate Change 2021: The Physical Science Basis report (See fig 7.3), but has only gotten worse.
And this crucial indicator was ignored in the recent 'IPCC' indicator updates (Piers Forster et al. 2023 & 2024).
And this crucial indicator was ignored in the recent 'IPCC' indicator updates (Piers Forster et al. 2023 & 2024).
May 1, 2026 at 7:06 PM
This data was already included in IPCC AR6 WG1 and should be included as a crucial climate indicator:
bsky.app/profile/leon...
bsky.app/profile/leon...