Flux continu

Elon Musk va occuper un poste de premier rang au sein d'un nouveau projet du Pentagone qui examinera le futur de la guerre, a indiqué mercredi le ministre américain de la Défense, Pete Hegseth, dans une base militaire de l'Etat de Virginie.

The ecological concept of human carrying capacity is necessarily complicated because human beings are the ‘ultimate ecosystem engineers’ who moderate the environment for their benefit. For at least the last few hundred years, human ingenuity, access to massive stocks of fossil fuels, and technological development have driven facilitation whereby increasing human abundance has promoted higher population growth rates. However, this positive relationship broke down during the 1950s, and by 1962, the global human population entered a phase where the growth rate consistently declined as population increased. The onset of this negative phase occurred 8 years before a global biocapacity deficit began in 1970. The onset of the negative phase also varies regionally, with the lowest-income and highest fertility regions entering this phase later than higher-income regions. A Ricker logistic model fitted to the negative phase predicts that the global population could reach 11.7–12.4 billion people between 2067 and 2076.

Le phénomène "Super El Niño" en cours pourrait provoquer plus de 450 000 décès liés à la chaleur d'ici février 2027, selon un rapport publié mercredi par le Climate Impact Lab. Les chercheurs y identifient les régions les plus menacées, et les mesures qui permettraient encore d'éviter cette hécatombe.

Une mobilisation nationale pour le climat, le vivant et la justice sociale aura lieu partout en France, le 26 septembre. Dans cette tribune, collégien·nes, lycéen·nes, étudiant·es et jeunes précaires invitent à prendre part à ce mouvement.

Climate models simulate a wide range of 21st century warming for a given forcing scenario. Constraining this uncertainty is a central challenge in climate science because of its implications for climate policy and adaptation. The Transient Climate Response (TCR) is a key idealized metric used to quantify future warming in response to an exponentially increasing CO2 concentration. Climate models span a range of 1.3–3 K for TCR. In attempts to constrain this range, emergent constraints on TCR based on historical temperature trends consistently pointed towards TCR values at the lower end of the range of models. However, recent evidence from trends in the short-wave and long-wave components of Earth's energy imbalance (EEI) at the top-of-atmosphere suggests that models with higher TCR lie closer to the observed EEI trends. Here, we reconcile this discrepancy and provide a revised range for TCR of 1.9–2.6 K. Using a statistical variability-filtering approach, we show that previous temperature-based constraints we

The concepts of Green Growth and Degrowth represent two major narratives in the public and academic debate on socio-ecological transformation. . . Using a comparative analysis of the two research fields, we confirm several findings from previous reviews, including that Green Growth research is highly policy oriented, focuses on practical implementation and builds on empirical research methods, while Degrowth research is highly theory-driven, focuses on the analysis of complex human-nature interrelationships and builds on a sound theoretical and conceptual foundation. Our analysis further reveals that Green Growth and Degrowth are two rather isolated fields of research with little exchange and mutual reference on related topics. However, the topic of social change and transition represents an intersecting and promising future research area. . . .

Nous vivons une époque étrange. Jamais l’humanité n’a disposé d’autant de connaissances, de technologies, de capacités de calcul et de moyens d’action sur le monde. Et pourtant, rarement avons-nous semblé aussi démunis lorsqu’il s’agit de décider collectivement où nous voulons aller.

Si notre pays est capable de mobiliser des ressources considérables contre le RISQUE de guerre, il doit être en mesure d’appréhender la CERTITUDE du dérèglement climatique et d’investir massivement dans la transition. Les contraintes de l’économie sont essentielles, mais celles du climat sont devenues vitales. Il appartient à la puissance publique et à tous nos dirigeants de les assumer toutes de front, sans concession.

Le gouvernement français a donné son feu vert à EDF pour engager les travaux préparatoires des deux futurs réacteurs de nouvelle génération EPR2 de la centrale nucléaire de Gravelines (Nord), selon un décret publié samedi au Journal officiel.

Climate models simulate a wide range of 21st century warming for a given forcing scenario. Constraining this uncertainty is a central challenge in climate science because of its implications for climate policy and adaptation. The transient climate response (TCR) is a key idealized metric used to quantify future warming in response to an exponentially increasing CO2 concentration. Climate models span a range of 1.3–3 K for TCR. In attempts to constrain this range, emergent constraints on TCR based on historical temperature trends consistently pointed toward TCR values at the lower end of the range of models. However, recent evidence from trends in the short-wave and long-wave components of Earth's energy imbalance (EEI) at the top-of-atmosphere suggests that models with higher TCR lie closer to the observed EEI trends. Here, we reconcile this discrepancy and provide a revised range for TCR of 1.9–2.6 K. Using a statistical variability-filtering approach, we show that previous temperature-based constraints wer