La veille

Dans une tribune au « Monde », l’universitaire polonais Maciej Kisilowski appelle à ne pas considérer l’ingérence russe comme la principale menace qui pèse sur la politique européenne. A ses yeux, le vrai danger réside dans l’essor des idées populistes et dans l’incapacité du camp progressiste à comprendre ses électeurs.

La dernière forêt primaire d’Europe de basse altitude, autrefois paisible, se retrouve depuis 2021 au cœur des tensions sécuritaires du flanc est de l’OTAN. Non sans conséquences sur sa biodiversité.

Le prix écologique et sanitaire de la consommation bon marché est payé, au bout du compte, par tous les citoyens, alerte Samuel Rebulard, ingénieur agronome et professeur agrégé à l’Université Paris-Saclay.

Le paradoxe est frappant : alors que le pouvoir d’achat culmine en tête des préoccupations de nos contemporains, nous consommons beaucoup trop au regard de nos besoins réels et des limites planétaires. Samuel Sauvage décrypte les rouages de cette addiction généralisée et de son corollaire, la production de masse. Une spirale implacable qu’il analyse à travers les mécanismes du « Bémol » : Besoins artificiels, Extension des marchés, Marchandisation de la société, Obsolescence programmée et Low cost. Pour sortir de cette spirale, la voie de l’action individuelle – la fameuse « consommation responsable » – doit être repensée et surtout intégrée à une démarche collective et systémique pour mettre un terme à la surconsommation. Face au Bémol, l’auteur appelle à un « Dièse » résolument politique : Désarmer la publicité, Impulser un nouvel imaginaire, Encadrer la production, Soutenir les alternatives, Embarquer les acteurs.

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

How does one talk about climate change when armed conflicts are spiralling out of control?

Le journaliste Nicolas Chevassus-au-Louis invite à une vaste réforme de la recherche, notamment pour réduire son empreinte carbone.

Scientists say ‘shocking’ discovery shows rapid cuts in carbon emissions are needed to avoid catastrophic fallout

Several, more recent global warming projections in the coupled model intercomparison project 6 contain extensions beyond year 2100–2300/2500. The Atlantic meridional overturning circulation (AMOC) in these projections shows transitions to extremely weak overturning below the surface mixed layer (<6 Sv; 1 Sv = 106 m3 s−1) in all models forced by a high-emission (SSP585) scenario and sometimes also forced by an intermediate- (SSP245) and low-emission (SSP126) scenario. These extremely weak overturning states are characterised by a shallow maximum overturning at depths less than 200 m and a shutdown of the circulation associated with North Atlantic deep water formation. Northward Atlantic heat transport at 26°N decreases to 20%–40% of the current observed value. Heat release to the atmosphere north of 45°N weakens to less than 20% of its present-day value and in some models completely vanishes, leading to strong cooling in the subpolar North Atlantic and Northwest Europe. In all cases, these transitions to a

Petite demo du spectacle clownesque "Osito et Nous" - Pour en savoir plus : www.yanncostaclown.org

Forests have historically acted as a reliable planetary thermostat. They regulate Earth’s temperature by removing carbon dioxide (CO2) from the atmosphere and locking it in trees, roots and soil — carbon that is emitted if trees are cut down. In a typical year, forests and other vegetation absorb roughly 30% of the carbon that humans emit from burning fossil fuels — a vital climate service performed at virtually no cost by trees around the world, from tropical rainforests to temperate and boreal forests.

2024 was the hottest year on record [1], with global temperatures exceeding 1.5 °C above preindustrial climate conditions for the first time and records broken across large parts of Earth’s surface. Among the widespread impacts of exceptional heat, rising food prices are beginning to play a prominent role in public perception, now the second most frequently cited impact of climate change experienced globally, following only extreme heat itself [2]. Recent econometric analysis confirms that abnormally high temperatures directly cause higher food prices, as impacts on agricultural production [3] translate into supply shortages and food price inflation [4, 5]. These analyses track changes in overall price aggregates which are typically slow-moving, but specific food goods can also experience much stronger short-term price spikes in response to extreme heat.

Comment démonter le mythe de la croissance infinie défendue entre autres par des géants de la Silicon Valley tel Elon Musk ou Jeff Bezos ? Comment mieux utiliser les ressources terrestres ? Afin de comprendre les enjeux vitaux qui nous talonnent, la BD "Ressources. Un défi pour l’humanité" apporte un éclairage pertinent pour nous inviter à penser et agir autrement. Son coauteur, Philippe Bihouix, ingénieur français promoteur des low-tech, était l’invité de Tendances Première.

Climate models that give a low warming from increases in greenhouse gases do not match satellite measurements. Future warming will likely be worse than thought unless society acts, according to a new study published in Science.

Le mag des technos douces et des futurs désirables On sait faire sobrement. On vous montre comment.