Valérie Masson-Delmotte
@valmasdel.bsky.social
PhD, climate scientist @lsce-ipsl.bsky.social @CEAParisSaclay @IPSL_outreach @hc_climat. Was co-chair @ipcc.bsky.social (AR6 WGI). Member of French Academy of Technology and Academy of Sciences.
Point clé de la gestion de crise et de l'adaptation au changement climatique : la continuité de l'accès à l'éducation, qui fait partie des droit des enfants, et dont la privation conduit à une perte d'égalité de chance.
www.mediapart.fr/journal/fran...
www.mediapart.fr/journal/fran...
À Mayotte, un an après le cyclone Chido, l’école continue de s’effondrer
L’État promettait une « reprise rapide » de la scolarité. Mais entre bâtiments détruits, salaires impayés et manque d’eau potable dans les établissements, la rentrée post-cyclone a viré au cauchemar …
www.mediapart.fr
November 6, 2025 at 3:23 PM
Point clé de la gestion de crise et de l'adaptation au changement climatique : la continuité de l'accès à l'éducation, qui fait partie des droit des enfants, et dont la privation conduit à une perte d'égalité de chance.
www.mediapart.fr/journal/fran...
www.mediapart.fr/journal/fran...
Un document concis et clair du @hc-climat.bsky.social
November 6, 2025 at 10:18 AM
Un document concis et clair du @hc-climat.bsky.social
Reposted by Valérie Masson-Delmotte
"Science is being destroyed across many agencies" say federal researchers.
For my latest @nature.com piece, I spoke to 19 different scientists across EPA, NOAA, NIH, NASA, and USGS to document how science is being dismantled across US federal agencies.
For my latest @nature.com piece, I spoke to 19 different scientists across EPA, NOAA, NIH, NASA, and USGS to document how science is being dismantled across US federal agencies.
Dismantling of US federal agencies will ‘destroy science’
From NASA to the National Institutes of Health, federal agencies conduct research that universities cannot. Agency scientists speak out about the irreplaceable facilities, institutional knowledge and ...
www.nature.com
November 4, 2025 at 2:58 PM
"Science is being destroyed across many agencies" say federal researchers.
For my latest @nature.com piece, I spoke to 19 different scientists across EPA, NOAA, NIH, NASA, and USGS to document how science is being dismantled across US federal agencies.
For my latest @nature.com piece, I spoke to 19 different scientists across EPA, NOAA, NIH, NASA, and USGS to document how science is being dismantled across US federal agencies.
Expert overview of advances and challenges for several articles of the Paris Agreement. I hope that future pieces will address Article 6 not screened here
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Expert retrospective on a decade of the Paris Agreement - Nature Climate Change
To mark the tenth anniversary of the Paris Agreement, Nature Climate Change asked experts to reflect on the progress of and barriers to several of its key Articles. They share their thoughts on import...
www.nature.com
November 6, 2025 at 7:07 AM
Expert overview of advances and challenges for several articles of the Paris Agreement. I hope that future pieces will address Article 6 not screened here
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Climate knowledge has now become legal evidence in the fight for climate justice
www.nature.com/articles/s41...
www.nature.com/articles/s41...
The expanding role of climate assessments as legal evidence - Nature Climate Change
The role of climate science is changing — fast. Once positioned to inform policy, scientific assessments are increasingly being used in courtrooms to substantiate claims of harm, causation and state r...
www.nature.com
November 6, 2025 at 7:02 AM
Climate knowledge has now become legal evidence in the fight for climate justice
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Valérie Masson-Delmotte
New national climate plans have barely moved the needle on limiting global warming. Yet there is hope.
According to UNEP's latest #EmissionsGap Report, accelerated adoption of renewable energy and falling costs mean we have the tools to cut emissions now: www.unep.org/news-and-sto...
According to UNEP's latest #EmissionsGap Report, accelerated adoption of renewable energy and falling costs mean we have the tools to cut emissions now: www.unep.org/news-and-sto...
November 4, 2025 at 2:08 PM
New national climate plans have barely moved the needle on limiting global warming. Yet there is hope.
According to UNEP's latest #EmissionsGap Report, accelerated adoption of renewable energy and falling costs mean we have the tools to cut emissions now: www.unep.org/news-and-sto...
According to UNEP's latest #EmissionsGap Report, accelerated adoption of renewable energy and falling costs mean we have the tools to cut emissions now: www.unep.org/news-and-sto...
Reposted by Valérie Masson-Delmotte
🚨🚨Things are just getting worse. 🧵
www.politico.eu/article/us-a...
www.politico.eu/article/us-a...
US accused of threatening EU diplomats during bid to kill green shipping rules
Negotiators at shipping talks in London were told both they and their countries could be punished unless they voted with the U.S.
www.politico.eu
November 3, 2025 at 12:07 PM
🚨🚨Things are just getting worse. 🧵
www.politico.eu/article/us-a...
www.politico.eu/article/us-a...
The economic case for methane action is clear.
- Global methane abatement yields large net global economic benefits.
- The benefit-cost ratio of methane action is at least 3—rising to more than 6 when health cobenefits are included.
www.science.org/doi/10.1126/...
- Global methane abatement yields large net global economic benefits.
- The benefit-cost ratio of methane action is at least 3—rising to more than 6 when health cobenefits are included.
www.science.org/doi/10.1126/...
October 31, 2025 at 9:39 AM
The economic case for methane action is clear.
- Global methane abatement yields large net global economic benefits.
- The benefit-cost ratio of methane action is at least 3—rising to more than 6 when health cobenefits are included.
www.science.org/doi/10.1126/...
- Global methane abatement yields large net global economic benefits.
- The benefit-cost ratio of methane action is at least 3—rising to more than 6 when health cobenefits are included.
www.science.org/doi/10.1126/...
Saving science by the sea | Science www.science.org/doi/10.1126/...
Saving science by the sea
As funding for science tightens across the United States, attention has turned to pressures faced by universities and biomedical research institutions. An often overlooked part of the nation’s science...
www.science.org
October 31, 2025 at 6:30 AM
Saving science by the sea | Science www.science.org/doi/10.1126/...
Reposted by Valérie Masson-Delmotte
📣 PRESS RELEASE
#IPCC opens 63rd Plenary Session in Lima to advance work on key climate reports
During the session, which runs from 27 to 31 October, “the Panel needs to settle the important matter of the timelines for producing the reports,” said IPCC Chair Jim Skea.
🔗 https://bit.ly/48Qx3AG
#IPCC opens 63rd Plenary Session in Lima to advance work on key climate reports
During the session, which runs from 27 to 31 October, “the Panel needs to settle the important matter of the timelines for producing the reports,” said IPCC Chair Jim Skea.
🔗 https://bit.ly/48Qx3AG
October 27, 2025 at 8:42 PM
📣 PRESS RELEASE
#IPCC opens 63rd Plenary Session in Lima to advance work on key climate reports
During the session, which runs from 27 to 31 October, “the Panel needs to settle the important matter of the timelines for producing the reports,” said IPCC Chair Jim Skea.
🔗 https://bit.ly/48Qx3AG
#IPCC opens 63rd Plenary Session in Lima to advance work on key climate reports
During the session, which runs from 27 to 31 October, “the Panel needs to settle the important matter of the timelines for producing the reports,” said IPCC Chair Jim Skea.
🔗 https://bit.ly/48Qx3AG
Reposted by Valérie Masson-Delmotte
This is cool, 6 million year old ice from Antartica with inferred temperature ~12°C warmer than the late Pleistocene. No CO2 level yet! (That will be highly anticipated!)
www.pnas.org/doi/10.1073/...
www.pnas.org/doi/10.1073/...
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
www.pnas.org
October 28, 2025 at 8:51 PM
This is cool, 6 million year old ice from Antartica with inferred temperature ~12°C warmer than the late Pleistocene. No CO2 level yet! (That will be highly anticipated!)
www.pnas.org/doi/10.1073/...
www.pnas.org/doi/10.1073/...
Reposted by Valérie Masson-Delmotte
🌀 Climate change made #HurricaneMelissa more intense.
📈 Up to 10% wetter (💧+14 mm/day)
💨 Up to 10% windier (+8 km/h)
Our new @climameter.bsky.social study shows that natural variability alone can’t explain these changes — human-caused warming is a key driver.
👉 climameter.org/20251027-hur...
📈 Up to 10% wetter (💧+14 mm/day)
💨 Up to 10% windier (+8 km/h)
Our new @climameter.bsky.social study shows that natural variability alone can’t explain these changes — human-caused warming is a key driver.
👉 climameter.org/20251027-hur...
October 28, 2025 at 4:59 PM
🌀 Climate change made #HurricaneMelissa more intense.
📈 Up to 10% wetter (💧+14 mm/day)
💨 Up to 10% windier (+8 km/h)
Our new @climameter.bsky.social study shows that natural variability alone can’t explain these changes — human-caused warming is a key driver.
👉 climameter.org/20251027-hur...
📈 Up to 10% wetter (💧+14 mm/day)
💨 Up to 10% windier (+8 km/h)
Our new @climameter.bsky.social study shows that natural variability alone can’t explain these changes — human-caused warming is a key driver.
👉 climameter.org/20251027-hur...
Rapid attribution study by @climameter.bsky.social @davifaranda.bsky.social of hurricane #melissa
More at climameter.org
More at climameter.org
October 28, 2025 at 4:57 PM
Rapid attribution study by @climameter.bsky.social @davifaranda.bsky.social of hurricane #melissa
More at climameter.org
More at climameter.org
Reposted by Valérie Masson-Delmotte
Reposted by Valérie Masson-Delmotte
A 10am EDT update from the National Hurricane Center now puts Melissa's sustained winds at 185 mph. Full text: www.nhc.noaa.gov/text/refresh...?
October 28, 2025 at 2:06 PM
A 10am EDT update from the National Hurricane Center now puts Melissa's sustained winds at 185 mph. Full text: www.nhc.noaa.gov/text/refresh...?
Reposted by Valérie Masson-Delmotte
Climate change DEFINITELY affects hurricane:
STRENGTH: Warmer water is hurricane food
RAINFALL: Warm air holds more water vapor
SURGE: Warmer water expands, warmer ice melts, sea levels rise
PREDICTION: hotter seas mean faster intensification
STRENGTH: Warmer water is hurricane food
RAINFALL: Warm air holds more water vapor
SURGE: Warmer water expands, warmer ice melts, sea levels rise
PREDICTION: hotter seas mean faster intensification
October 28, 2025 at 1:48 PM
Climate change DEFINITELY affects hurricane:
STRENGTH: Warmer water is hurricane food
RAINFALL: Warm air holds more water vapor
SURGE: Warmer water expands, warmer ice melts, sea levels rise
PREDICTION: hotter seas mean faster intensification
STRENGTH: Warmer water is hurricane food
RAINFALL: Warm air holds more water vapor
SURGE: Warmer water expands, warmer ice melts, sea levels rise
PREDICTION: hotter seas mean faster intensification
Russia arrests Ukrainian biologist for backing curbs on Antarctic krill fishing
www.theguardian.com/environment/...
www.theguardian.com/environment/...
Russia arrests Ukrainian biologist for backing curbs on Antarctic krill fishing
‘Trumped-up’ charges spark diplomatic row as scientists express fears for health of 70-year-old Leonid Pshenichnov
www.theguardian.com
October 26, 2025 at 9:47 PM
Russia arrests Ukrainian biologist for backing curbs on Antarctic krill fishing
www.theguardian.com/environment/...
www.theguardian.com/environment/...
Reposted by Valérie Masson-Delmotte
The Billion Dollar Weather and Climate Disaster dataset is back and now at @climatecentral.org!
Through the first half of 2025, there were 14 separate billion-dollar weather and climate disasters across the United States, costing $101.4 billion. 1/2
www.climatecentral.org/climate-serv...
Through the first half of 2025, there were 14 separate billion-dollar weather and climate disasters across the United States, costing $101.4 billion. 1/2
www.climatecentral.org/climate-serv...
October 22, 2025 at 2:21 PM
The Billion Dollar Weather and Climate Disaster dataset is back and now at @climatecentral.org!
Through the first half of 2025, there were 14 separate billion-dollar weather and climate disasters across the United States, costing $101.4 billion. 1/2
www.climatecentral.org/climate-serv...
Through the first half of 2025, there were 14 separate billion-dollar weather and climate disasters across the United States, costing $101.4 billion. 1/2
www.climatecentral.org/climate-serv...
Reposted by Valérie Masson-Delmotte
We are Climate.us, a nonprofit successor to Climate(.)gov.
Our goal is to build an enduring, independent, and scientifically rigorous platform that the world can rely on for climate communication, education, and engagement. Stay up to date: #updatesmate.us/#updates" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">Climate.us/#updates
Our goal is to build an enduring, independent, and scientifically rigorous platform that the world can rely on for climate communication, education, and engagement. Stay up to date: #updatesmate.us/#updates" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">Climate.us/#updates
October 22, 2025 at 10:17 PM
We are Climate.us, a nonprofit successor to Climate(.)gov.
Our goal is to build an enduring, independent, and scientifically rigorous platform that the world can rely on for climate communication, education, and engagement. Stay up to date: #updatesmate.us/#updates" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">Climate.us/#updates
Our goal is to build an enduring, independent, and scientifically rigorous platform that the world can rely on for climate communication, education, and engagement. Stay up to date: #updatesmate.us/#updates" class="hover:underline text-blue-600 dark:text-sky-400 no-card-link" target="_blank" rel="noopener" data-link="bsky">Climate.us/#updates
Reposted by Valérie Masson-Delmotte
La perturbation automnale active d'hier a généreusement arrosé l'ouest de la Corse. Hier il est tombé 52 mm à Ajaccio ; ajoutés aux 24 mm du 16 octobre, cela fait plus de pluie en une semaine que les 4 mois et demi de mai à mi octobre.
#sécheresse #Corse Depuis le 1er mai il est tombé seulement 60 mm de pluie à Ajaccio. Il faut remonter 55 ans en arrière pour retrouver une telle période moins arrosée (49 mm en 1970). La différence avec 1970 c'est qu'il a fait incomparablement plus chaud en 2025 à #Ajaccio (+3.0 °C / 1970)...
October 21, 2025 at 8:41 AM
La perturbation automnale active d'hier a généreusement arrosé l'ouest de la Corse. Hier il est tombé 52 mm à Ajaccio ; ajoutés aux 24 mm du 16 octobre, cela fait plus de pluie en une semaine que les 4 mois et demi de mai à mi octobre.
Reposted by Valérie Masson-Delmotte
En octobre il n'a jamais fait plus de 20 °C à #Paris et c'est exceptionnel. Malgré une relative douceur en ce début de semaine il est probable que le maximum du mois d'octobre au Parc Montsouris soit derrière nous avec 20.0 °C le 1er. Soit la plus basse valeur en la matière depuis 1998 (19.1°C).
October 20, 2025 at 5:48 AM
En octobre il n'a jamais fait plus de 20 °C à #Paris et c'est exceptionnel. Malgré une relative douceur en ce début de semaine il est probable que le maximum du mois d'octobre au Parc Montsouris soit derrière nous avec 20.0 °C le 1er. Soit la plus basse valeur en la matière depuis 1998 (19.1°C).
Reposted by Valérie Masson-Delmotte
Record warm conditions continue in the northernmost portions of the #Arctic Ocean, near the North Pole. This anomalous warmth is forecast to continue over the next week or so too.
More graphics: zacklabe.com/arctic-tempe...
More graphics: zacklabe.com/arctic-tempe...
October 18, 2025 at 1:59 PM
Record warm conditions continue in the northernmost portions of the #Arctic Ocean, near the North Pole. This anomalous warmth is forecast to continue over the next week or so too.
More graphics: zacklabe.com/arctic-tempe...
More graphics: zacklabe.com/arctic-tempe...