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Depuis l’élection de Donald Trump en novembre 2024, la fortune des milliardaires a augmenté à un rythme trois fois plus élevé que la moyenne annuelle des cinq années précédentes1. Si les milliardaires états-unien·nes ont connu la plus forte croissance, celles et ceux du reste du monde ont également enregistré des augmentations à deux chiffres de leur fortune. Les mesures prises sous la présidence Trump, notamment la promotion de la déréglementation et le démantèlement des accords visant à renforcer l’imposition des entreprises, ont profité aux plus riches à travers le monde.

Launched at the COP30 Belém Climate Summit, the Global Status of Multi-Hazard Early Warning Systems 2025 report provides a snapshot of progress in the implementation of the UN's flagship Early Warnings for All (EW4All) initiative, which aims to protect every person on Earth with an early warning system by 2027. The report reveals measurable progress, with 119 countries, or 60% of all countries, now reporting the existence of a Multi-Hazard Early Warning System. This is a 113% increase over the past 10 years. However, coverage gaps persist, especially among small island developing States, as only 43% of them reported having systems in place.

GLOBAL TIPPING POINTS REPORT 2025 - Summary

GLOBAL TIPPING POINTS REPORT - 2025

We report striking discoveries of numerous seafloor seeps of climate-reactive fluid and gases in the coastal Ross Sea, indicating this process may be a common phenomenon in the region. We establish the recent emergence of many of these seep features, based on their discovery in areas routinely surveyed for decades with no previous seep presence. Additionally, we highlight impacts to the local benthic ecosystem correlated to seep presence and discuss potential broader implications. With these discoveries, our understanding of Antarctic seafloor seeps shifts from them being rare phenomenon to seemingly widespread, and an important question is raised about the driver of seep emergence in the region. While the origin and underlying mechanisms of these emerging seep systems remains unknown, similar processes in the paleo-record and the Arctic have been attributed to climate-driven cryospheric change. Such a mechanism may be widespread around the Antarctic Continent, with concerning positive feedbacks that are curr

La France s'adapte ... Vivre à plus de 4° - La trajectoire de réchauffement de référence pour l’adaptation au changement climatique anticipe à ce jour une hausse de la température moyenne dans l’Hexagone qui atteindra +4 °C à la fin du siècle.

Selon Eurostat, qui publie les statistiques annuelles pour chaque pays européen, cette intensité carbone a significativement baissé en France et en Allemagne entre 2013 et 2022, mais l’industrie manufacturière française semble nettement plus carbonée que son homologue allemande. Quelle est l’origine − technologique, économique, statistique − de cet avantage allemand ?

Anthropogenic emissions drive global-scale warming yet the temperature increase relative to pre-industrial levels is uncertain. Using 300 years of ocean mixed-layer temperature records preserved in sclerosponge carbonate skeletons, we demonstrate that industrial-era warming began in the mid-1860s, more than 80 years earlier than instrumental sea surface temperature records. The Sr/Ca palaeothermometer was calibrated against ‘modern’ (post-1963) highly correlated (R2 = 0.91) instrumental records of global sea surface temperatures, with the pre-industrial defined by nearly constant (<±0.1 °C) temperatures from 1700 to the early 1860s. Increasing ocean and land-air temperatures overlap until the late twentieth century, when the land began warming at nearly twice the rate of the surface oceans. Hotter land temperatures, together with the earlier onset of industrial-era warming, indicate that global warming was already 1.7 ± 0.1 °C above pre-industrial levels by 2020. Our result is 0.5 °C higher than IPCC estim

Global warming is accelerating because the drive for warming, Earth’s energy imbalance, has doubled in the past decade. Measurement of the acceleration is hampered by unforced tropical (El Nino/La Nina) variability, but a good measuring stick is provided by warming between successive large El Ninos. Strengthening of the current (2023-24) El Nino has raised it to a level similar to the 1997-98 and 2015-16 El Ninos. The first six months of the current El Nino are 0.39°C warmer than the same six months of the 2015-16 El Nino, a global warming rate of 0.49°C/decade, consistent with expectation of a large acceleration of global warming. We expect the 12-month mean temperature by May 2024 to eliminate any doubt about global warming acceleration. Subsequent decline of the 12-month temperature below 1.5°C will likely be limited, confirming that the 1.5°C limit has already been passed.

Le nouveau tableau de bord sur le climat collecte des informations et des indicateurs relatifs au changement climatique et au financement durable. Par cette initiative, la Banque nationale de Belgique souhaite encore mieux informer le grand public des conséquences pour l'économie et le système financier du changement climatique et de la transition vers la fin des émissions nettes de gaz à effet de serre.

La Niña is present.* Equatorial sea surface temperatures (SSTs) are below average across most of the Pacific Ocean. The tropical Pacific atmosphere is consistent with La Niña. La Niña is expected to continue into the winter, with equal chances of La Niña and ENSO-neutral during January-March 2023. In February-April 2023, there is a 71% chance of ENSO-neutral.*

Cette semaine il s’est passé une chose dans l’actualité climatique française qui mérite de s’y attarder, au vu des incompréhensions et des controverses suscitées. L’info en question : la stratégie d’adaptation au changement climatique de la France va désormais s’appuyer aussi sur l’hypothèse d’un réchauffement de + 4°C (semble-t-il en France même si cela n’a pas été précisé) d'ici la fin du siècle... ce qui correspondrait à un

Cette semaine il s’est passé une chose dans l’actualité climatique française qui mérite de s’y attarder, au vu des incompréhensions et des controverses suscitées. L’info en question : la stratégie d’adaptation au changement climatique de la France va désormais s’appuyer aussi sur l’hypothèse d’un réchauffement de + 4°C (semble-t-il en France même si cela n’a pas été précisé) d'ici la fin du siècle... ce qui correspondrait à un

Cette étude est d’une importance majeure. Elle réévalue l’ampleur du réchauffement climatique à venir, réchauffement qui pourra aller, selon les auteurs, jusqu’à 10 ° C. Une valeur bien supérieure à celles estimées dans les pires scénarios du GIEC, et sur la seule base des quantités actuelles de GES émis jusqu’à ce jour… Makiko Sato, Leon Simons, Larissa S. Nazarenko, Karina von Schuckmann, Norman G. Loeb, Matthew B. Osman, Pushker Kharecha, Qinjian Jin, George Tselioudis, Andrew Lacis, Reto Ruedy, Gary Russell, Junji Cao, Jing Li ___ : ___ source : https://transitionecologique.org/2022/12/20/rechauffement-climatique-en-vue/

Improved knowledge of glacial-to-interglacial global temperature change implies that fast- feedback equilibrium climate sensitivity is at least ~4°C for doubled CO2 (2×CO2), with likely range 3.5-5.5°C. Greenhouse gas (GHG) climate forcing is 4.1 W/m2 larger in 2021 than in 1750, equivalent to 2×CO2 forcing. Global warming in the pipeline is greater than prior estimates. Eventual global warming due to today’s GHG forcing alone – after slow feedbacks operate – is about 10°C. Human-made aerosols are a major climate forcing, mainly via their effect on clouds. We infer from paleoclimate data that aerosol cooling offset GHG warming for several millennia as civilization developed. A hinge-point in global warming occurred in 1970 as increased GHG warming outpaced aerosol cooling, leading to global warming of 0.18°C per decade. Aerosol cooling is larger than estimated in the current IPCC report, but it has declined since 2010 because of aerosol reductions in China and shipping. Without unprecedented global actions to

Persistent heat extremes can have severe impacts on ecosystems and societies, including excess mortality, wildfires, and harvest failures. Here we identify Europe as a heatwave hotspot, exhibiting upward trends that are three-to-four times faster compared to the rest of the northern midlatitudes over the past 42 years. This accelerated trend is linked to atmospheric dynamical changes via an increase in the frequency and persistence of double jet stream states over Eurasia. We find that double jet occurrences are particularly important for western European heatwaves, explaining up to 35% of temperature variability. The upward trend in the persistence of double jet events explains almost all of the accelerated heatwave trend in western Europe, and about 30% of it over the extended European region. Those findings provide evidence that in addition to thermodynamical drivers, atmospheric dynamical changes have contributed to the increased rate of European heatwaves, with implications for risk management and potent

le rapport 2022 du financement du chaos climatique par les banques. Avec résumé en français.

Le financement des énergies fossiles par les 60 plus grandes banques au monde a atteint 4 600 milliards de dollars sur les six années qui nous séparent de l'adoption de l'accord de Paris, avec 742 milliards pour la seule année 2021. Ce rapport examine le financement des banques commerciales et d'investissement à l'industrie des énergies fossiles - prenant en compte leurs rôles de prêteur et d'émetteur d'actions et de titres de dette - et en conclut que, même au cours d'une année où les engagements « zéro émission nette » étaient très en vogue, le secteur financier a continué, par sa logique de business as usual, à alimenter le chaos climatique.

Following record-level declines in 2020, near-real-time data indicate that global CO2 emissions rebounded by 4.8% in 2021, reaching 34.9 GtCO2. These 2021 emissions consumed 8.7% of the remaining carbon budget for limiting anthropogenic warming to 1.5 °C, which if current trajectories continue, might be used up in 9.5 years at 67% likelihood.

The IPCC has finalized the second part of the Sixth Assessment Report, Climate Change 2022: Impacts, Adaptation and Vulnerability, the Working Group II contribution to the Sixth Assessment Report. It was finalized on 27 February 2022 during the 12th Session of Working Group II and 55th Session of the IPCC. Read the report here