La veille

For decades, the surface of the polar Southern Ocean (south of 50°S) has been freshening—an expected response to a warming climate. This freshening enhanced upper-ocean stratification, reducing the upward transport of subsurface heat and possibly contributing to sea ice expansion. It also limited the formation of open-ocean polynyas. Using satellite observations, we reveal a marked increase in surface salinity across the circumpolar Southern Ocean since 2015. This shift has weakened upper-ocean stratification, coinciding with a dramatic decline in Antarctic sea ice coverage. Additionally, rising salinity facilitated the reemergence of the Maud Rise polynya in the Weddell Sea, a phenomenon last observed in the mid-1970s.

In a rapidly changing climate, evidence-based decision-making benefits from up-to-date and timely information. Here we compile monitoring datasets (published at https://doi.org/10.5281/zenodo.15639576; Smith et al., 2025a) to produce updated estimates for key indicators of the state of the climate system: net emissions of greenhouse gases and short-lived climate forcers, greenhouse gas concentrations, radiative forcing, the Earth's energy imbalance, surface temperature changes, warming attributed to human activities, the remaining carbon budget, and estimates of global temperature extremes. This year, we additionally include indicators for sea-level rise and land precipitation change. We follow methods as closely as possible to those used in the IPCC Sixth Assessment Report (AR6) Working Group One report.

An international group of researchers has produced a third update to key indicators of the state of the climate system set out in the IPCC AR6 assessment, building on previous editions in 2023 and 2024. Forster et al. (2025) assess emissions, concentrations, temperatures, energy transfers, radiation balances, and the role of human activity and conclude that, while natural climate variability also played a role, the record observed temperatures in 2024 were dominated by human activity and the remaining carbon budget for 1.5° C is smaller than ever.

Le feu qui s’était déclaré sur un site de traitement de déchets classé Seveso à Rognac (Bouches-du-Rhône), est désormais éteint, selon la préfecture qui n’a pas relevé de toxicité dans l’air mais une pollution dans l’étang de Berre.

Recent simulations using the Community Earth System Model (CESM) indicate that a tipping event of the Atlantic Meridional Overturning Circulation (AMOC) would cause Europe to cool by several degrees. This AMOC tipping event was found under constant pre-industrial greenhouse gas forcing, while global warming likely limits this AMOC-induced cooling response. Here, we quantify the European temperature responses under different AMOC regimes and climate change scenarios. A strongly reduced AMOC state and intermediate global warming (C, Representative Concentration Pathway 4.5) has a profound cooling effect on Northwestern Europe with more intense cold extremes. The largest temperature responses are found during the winter months and these responses are strongly influenced by the North Atlantic sea-ice extent. Enhanced North Atlantic storm track activity under an AMOC collapse results in substantially larger day-to-day temperature fluctuations. We conclude that the (far) future European temperatures are dependent o

Washington, Chicago, New Orleans en andere dichtbevolkte steden in de Verenigde Staten zijn aan het zinken, blijkt uit onderzoek in Nature. Het massale gebruik van grondwater is een belangrijke oorzaak, maar er spelen ook andere factoren.

Le président ukrainien Volodymyr Zelensky a appelé Donald Trump à se rendre en Ukraine pour constater la dévastation laissée par l'agression russe, dans une interview diffusée dimanche sur la chaîne de télévision américaine CBS.

Une série de feux de forêt, parmi les plus dévastateurs de l'histoire de la Corée du Sud, a fait au moins 24 morts, entraînant des "dommages sans précédent" et dépassant toutes les prévisions.

L'Observatoire européen austral (ESO) a averti lundi que le projet de centrale électrique prévu à proximité de ses télescopes dans le désert d'Atacama, dans le nord du Chili, pourrait avoir un impact "dévastateur" sur l'observation du ciel. La pollution lumineuse générée par le projet pourrait, selon l'organisme dédié à la recherche astronomique, perturber l'observation d'un des ciels les plus purs et étoilés du monde.

The clear signs of human-induced climate change reached new heights in 2024, which was likely the first calendar year to be more than 1.5°C above the pre-industrial era, with a global mean near-surface temperature of 1.55 ± 0.13 °C above the 1850-1900 average.

The ocean ecosystem is a vital component of the global carbon cycle, storing enough carbon to keep atmospheric CO2 considerably lower than it would otherwise be. However, this conception is based on simple models, neglecting the coupled land-ocean feedback. Using an interactive Earth system model, we show that the role ocean biology plays in controlling atmospheric CO2 is more complex than previously thought. Atmospheric CO2 in a new equilibrium state after the biological pump is shut down increases by more than 50% (163 ppm), lower than expected as approximately half the carbon lost from the ocean is adsorbed by the land. The abiotic ocean is less capable of taking up anthropogenic carbon due to the warmer climate, an absent biological surface pCO2 deficit and a higher Revelle factor. Prioritizing research on and preserving marine ecosystem functioning would be crucial to mitigate climate change and the risks associated with it.

Met de aantrede van Trump in Witte Huis zouden we in een nieuwe, donkere periode kunnen terechtkomen. Een periode waarin extreemrechtse krachten wereldwijd hun duivels ontbinden. Tijd om ons schrap te zetten.

Les récentes mesures satellitaires révèlent une augmentation alarmante du HFC-125, un gaz à effet de serre 3 500 fois plus puissant que le CO₂, posant un défi urgent pour la régulation climatique mondiale.

Emerging infectious diseases, biodiversity loss, and anthropogenic environmental change are interconnected crises with massive social and ecological costs. In this Review, we discuss how pathogens and parasites are responding to global change, and the implications for pandemic prevention and biodiversity conservation. Ecological and evolutionary principles help to explain why both pandemics and wildlife die-offs are becoming more common; why land-use change and biodiversity loss are often followed by an increase in zoonotic and vector-borne diseases; and why some species, such as bats, host so many emerging pathogens. To prevent the next pandemic, scientists should focus on monitoring and limiting the spread of a handful of high-risk viruses, especially at key interfaces such as farms and live-animal markets. But to address the much broader set of infectious disease risks associated with the Anthropocene, decision-makers will need to develop comprehensive strategies that include pathogen surveillance across s

In België dreigen woningen door klimaatrampen nog niet onverzekerbaar te worden, zoals dat in de Verenigde Staten wel al het geval is. Maar de klimaatverandering stelt verzekeringsmaatschappijen wel voor andere uitdagingen. Zo is nog steeds niet duidelijk wie de factuur van een volgende waterramp zou moeten dragen, en in hoeverre de overheid daarbij tussenbeide zou komen, klagen de verzekeringsmaatschappijen aan.