Veille 2.1

Le milliardaire s’est souvent montré dubitatif, et parfois hostile, quant à la poursuite de l’aide américaine à l’Ukraine et a même menacé de sortir de l’OTAN s’il revenait à la Maison Blanche.

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

Vertement critiqué pour la "pause" annoncée sur le plan de réduction des pesticides, le gouvernement défend l'idée de "sortir de l'écologie punitive", mais ses opposants dénoncent une rupture avec le "quinquennat écologique" promis par Emmanuel Macron. Après deux semaines de fronde agricole, l'exécutif a mis fin au mouvement au prix de nombreuses concessions. Notamment sur le 4e plan Ecophyto qui fixait un objectif de réduction de 50 % de l'usage des pesticides d'ici 2030 (par rapport à 2015-2017) et que le gouvernement a décidé jeudi de "mettre en pause".

Permafrost and glaciers in the high Arctic form an impermeable ‘cryospheric cap’ that traps a large reservoir of subsurface methane, preventing it from reaching the atmosphere. Cryospheric vulnerability to climate warming is making releases of this methane possible. On Svalbard, where air temperatures are rising more than two times faster than the average for the Arctic, glaciers are retreating and leaving behind exposed forefields that enable rapid methane escape. Here we document how methane-rich groundwater springs have formed in recently revealed forefields of 78 land-terminating glaciers across central Svalbard, bringing deep-seated methane gas to the surface. Waters collected from these springs during February–May of 2021 and 2022 are supersaturated with methane up to 600,000 times greater than atmospheric equilibration. Spatial sampling reveals a geological dependency on the extent of methane supersaturation, with isotopic evidence of a thermogenic source. We estimate annual methane emissions from prog

Sweden formally renounces EU net zero roadmap championed by the likes of Germany.

Les Engagés dénoncent le renoncement des verts. Et proposent des mesures alternatives.

Pour financer leur action climatique, les pays du Sud auront besoin de 2 400 milliards de dollars par an d'ici 2030, selon le rapport intitulé Le financement de l'action climatique, accroître les investissements pour le climat et le développement, co-dirigé par l’économiste britannique Nicholas Stern et l’économiste camerounaise Vera Songwe. À quoi va servir cet argent et comment le mobiliser ?

Le changement climatique et la pollution de l'air tuent déjà "à grande échelle" a martelé jeudi lors d'une conférence à Londres le professeur Nicholas Stern, auteur d'un célèbre rapport précurseur sur la sévérité du réchauffement publié il y a plus de 15 ans. Il a averti qu'une élévation de 3 à 4 degrés de la température planétaire, "de l'ordre du possible", serait "dévastatrice" et provoquerait des température "extrêmes" voire "meurtrières" dans des zones très peuplées du monde comme en Inde ou en Chine qui conduiraient au déplacement ou à la mort de centaines de millions de personnes.

Le professeur Nicholas Stern à chercher à mettre en garde les spectateurs de sa conférence à Londres ce jeudi face à des conséquences dramatiques du changement climatique.

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

‘This event is completely unprecedented and upended our expectations about the Antarctic climate system,’ one expert said

The Ukrainian crisis has revived an old debate: how to effectively sanction a state like Russia? Let’s say it straight away: it is time to imagine a new type of sanction focused on the oligarchs who have prospered thanks to the regime in question. This will require the establishment of an international financial register, which will not be to the liking of western fortunes, whose interests are much more closely linked to those of the Russian and Chinese oligarchs than is sometimes claimed. However, it is at this price that western countries will succeed in winning the political and moral battle against the autocracies and in demonstrating to the world that the resounding speeches on democracy and justice are not simply empty words.

Many economic assessments of the climate crisis “grossly undervalue the lives of young people and future generations”, Prof Nicholas Stern warned on Tuesday, before the Cop26 climate summit in Glasgow.

All available evidence taken together, including physical understanding, observations over a larger region and different regional climate models give high confidence that human-induced climate change has increased the likelihood and intensity of such an event to occur and these changes will continue in a rapidly warming climate

During the last days of June 2021, Pacific northwest areas of the U.S. and Canada experienced temperatures never previously observed, with records broken in many places by several degrees Celsius.