Fiches info

L’effondrement global arrive par morceaux. L’Allemagne est la première.

L’Effondrement de 2026 - L’alerte de Fred Harrison […] Il nous avait prévenu en 1990. Il nous avait prévenu en 2008. Les deux fois, le monde l'a ignoré. Les deux fois, il avait raison. Fred Harrison, l'économiste qui avait anticipé les deux dernières grandes récessions, tire une nouvelle fois la sonnette d'alarme et cette fois, il affirme que l'effondrement a une date.

Existential Risk and Global Catastrophic - Risk: A Review

Le rapport 2025 sur les états de fragilité se penche sur un monde marqué par des rapports de force en pleine recomposition : c’est dans les 61 contextes présentant un degré élevé ou extrême de fragilité que les effets les plus dramatiques des crises, des conflits et de l’instabilité trouvent leur point de convergence. La fragilité multidimensionnelle est en effet au cœur d’évolutions géopolitiques qui mettent à mal des décennies d’équilibre des forces à l’échelle mondiale ; tant les défis que les possibilités qu’elle apporte appellent une réflexion approfondie et une adaptation rapide de l’ensemble des sphères de l’action humanitaire, du développement et de la paix.

Human pressures have pushed the Earth system deep into the Anthropocene, threatening its stability, resilience and functioning. The Planetary Boundaries (PB) framework emerged against these threats, setting safe levels to the biophysical systems and processes that, with high likelihood, ensure life-supporting Holocene-like conditions. In this Review, we synthesize PB advancements, detailing its emergence and mainstreaming across scientific disciplines and society. The nine PBs capture the key functions regulating the Earth system. The safe operating space has been transgressed for six of these. PB science is essential to prevent further Earth system risks and has sparked new research on the precision of safe boundaries. Human development within planetary boundaries defines sustainable development, informing advances in social sciences. Each PB translates to a finite budget that the world must operate within, requiring strengthened global governance. The PB framework has been adopted by businesses and informed

There is increasing concern that the Atlantic Meridional Overturning Circulation (AMOC) may collapse this century with a disrupting societal impact on large parts of the world. Preliminary estimates of the probability of such an AMOC collapse have so far been based on conceptual models and statistical analyses of proxy data. Here, we provide observationally based estimates of such probabilities from reanalysis data. We first identify optimal observation regions of an AMOC collapse from a recent global climate model simulation. Salinity data near the southern boundary of the Atlantic turn out to be optimal to provide estimates of the time of the AMOC collapse in this model. Based on the reanalysis products, we next determine probability density functions of the AMOC collapse time. The collapse time is estimated between 2037-2064 (10-90% CI) with a mean of 2050 and the probability of an AMOC collapse before the year 2050 is estimated to be 59±17%.

Bouleversements planétaires : évolution des pratiques professionnelles en santé

Life on planet Earth is under siege. We are now in an uncharted territory. For several decades, scientists have consistently warned of a future marked by extreme climatic conditions because of escalating global temperatures caused by ongoing human activities that release harmful greenhouse gasses into the atmosphere. Unfortunately, time is up. We are seeing the manifestation of those predictions as an alarming and unprecedented succession of climate records are broken, causing profoundly distressing scenes of suffering to unfold. We are entering an unfamiliar domain regarding our climate crisis, a situation no one has ever witnessed firsthand in the history of humanity.

The Atlantic meridional overturning circulation (AMOC) is a major tipping element in the climate system and a future collapse would have severe impacts on the climate in the North Atlantic region. In recent years weakening in circulation has been reported, but assessments by the Intergovernmental Panel on Climate Change (IPCC), based on the Climate Model Intercomparison Project (CMIP) model simulations suggest that a full collapse is unlikely within the 21st century. Tipping to an undesired state in the climate is, however, a growing concern with increasing greenhouse gas concentrations. Predictions based on observations rely on detecting early-warning signals, primarily an increase in variance (loss of resilience) and increased autocorrelation (critical slowing down), which have recently been reported for the AMOC. Here we provide statistical significance and data-driven estimators for the time of tipping. We estimate a collapse of the AMOC to occur around mid-century under the current scenario of future emi

Improved knowledge of glacial-to-interglacial global temperature change implies that fastfeedback equilibrium climate sensitivity (ECS) is 1.2 ± 0.3°C (2σ) per W/m2 . Consistent analysis of temperature over the full Cenozoic era – including “slow” feedbacks by ice sheets and trace gases – supports this ECS and implies that CO2 was about 300 ppm in the Pliocene and 400 ppm at transition to a nearly ice-free planet, thus exposing unrealistic lethargy of ice sheet models. Equilibrium global warming including slow feedbacks for today’s human-made greenhouse gas (GHG) climate forcing (4.1 W/m2) is 10°C, reduced to 8°C by today’s aerosols. Decline of aerosol emissions since 2010 should increase the 1970-2010 global warming rate of 0.18°C per decade to a post-2010 rate of at least 0.27°C per decade. Under the current geopolitical approach to GHG emissions, global warming will likely pierce the 1.5°C ceiling in the 2020s and 2°C before 2050. Impacts on people and nature will accelerate as global warming pumps up hydr

The stability and resilience of the Earth system and human well-being are inseparably linked1–3, yet their interdependencies are generally under-recognized; consequently, they are often treated independently4,5. Here, we use modelling and literature assessment to quantify safe and just Earth system boundaries (ESBs) for climate, the biosphere, water and nutrient cycles, and aerosols at global and subglobal scales. We propose ESBs for maintaining the resilience and stability of the Earth system (safe ESBs) and minimizing exposure to significant harm to humans from Earth system change (a necessary but not sufficient condition for justice)4. The stricter of the safe or just boundaries sets the integrated safe and just ESB. Our findings show that justice considerations constrain the integrated ESBs more than safety considerations for climate and atmospheric aerosol loading. Seven of eight globally quantified safe and just ESBs and at least two regional safe and just ESBs in over half of global land area are alrea

Cette étude a pour but d’amener à réfléchir sur les raisons profondes des échecs des COPs depuis 27 ans et des COPs à venir, en utilisant un angle de vision mathématique global et neutre. Alexandre DUMAS a écrit : "n'estimez l'argent ni plus ni moins qu'il ne vaut : c'est un bon serviteur et un mauvais maître." L’argent est un outil inventé pour faciliter les échanges, un moyen de substitution au troc. La financiarisation de l’économie concentre la monnaie, transformant l’argent, outil serviteur, en un mauvais maître, créancier conditionnant son débiteur à une contrainte exclusivement financière.

L'IGN publie son premier atlas des cartes de l'anthropocène. Une invitation à changer d'échelle pour pouvoir agir.

Pour l'historien Lucian Boia, les récits de la fin du monde renvoient, par-delà leurs différences patentes, aux mêmes structures archétypales, qu’il associe essentiellement aux imaginaires de la divination et de l’évasion. Apparue en France en 2015, la collapsologie fait écho aux prophéties de malheur qui se succèdent depuis des millénaires pour annoncer la fin du monde. L’ampleur et la réalité des menaces relevées par les théoriciens de l’effondrement tendent néanmoins à disqualifier l’analogie entre leur prédiction et les mythes de la fin du monde relevant de croyances religieuses ou de scénarios de science-fiction...

Contributions dans Le Monde

Climate endgame is the name some scientists have given to the hypothesis of a global societal collapse due to effects of climate change. The real chance of happening is considered small, but the researchers who warned most resoundingly about this danger in August 2022 seek to improve risk management by putting a higher priority on worst-case scenarios, to "galvanise action, improve resilience, and inform policy".

Our World at Risk: Transforming Governance for a Resilient Future

Conference: Doctorales 2022 de la Société Française des Sciences de l'Information et de la Communication (SFSIC)At: Dijon

Le 25 janvier 2022, Aurore STEPHANT, représentant l’association SystExt, a été interviewée dans l’émission Thinkerview. L’entretien, intitulé "L'effondrement : le point critique ?" d’une durée de 03h10min, porte sur plusieurs thématiques relatives aux mines et filières minérales.

Enseignant dans une grande école d’Ingénieurs en Suisse, très engagé dans la sensibilisation des étudiant·e·s à la crise écologique et aux immenses défis du XXIème siècle, Dominique a également co-organisé – avec la Maison du Dessin de Presse à Morges – un événement de sensibilisation à l’urgence écologique à partir de dessins de presse du monde entier et de grands tableaux historiques co-réalisés avec son équipe pour présenter les Événements et catastrophes ; les livres clés, rapports et lois ; les sommets, réunions, conventions et manifestations ; et enfin les organisations engagées.