Jean-Pascal Van Ypersele

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Project

2026

Het KMI start het project 'Tales of Future Weather', dat klimaatwetenschap omzet naar concrete scenario’s van extreem weer zoals hitte, droogte en hevige neerslag. Zo worden de gevolgen van klimaatverandering tastbaar en kunnen we ons beter voorbereiden. Het project benadrukt dat burgers zelfredzamer moeten worden. "Er komt heel wat op ons af."
The Global Justice Project attempts to set out a new vision for global progress in the 21st century: grounding human development and equality in planetary habitability. It explores the conditions under which the world could move toward this horizon and traces an economically and ecologically consistent transition path from 2026 to 2100.
Projections of near-term climate change are a potential research tool. However, for that tool to be most useful, the physical basis for a prediction must be made clear. The basis for our projection of record 2026 global temperature is high climate sensitivity, with its implication that aerosol cooling was still increasing during the period 1970-2005. One consequence, global sea surface warming, already has important effects. Causes of climate change must be understood for policy purposes. Figures in this post and our recent papers are continually updated on our website.[1] We are also now on Substack[2].
Les scénarios socio-économiques et les niveaux de réchauffement planétaire qui en résultent structurent la compréhension des chaines de causalité entre les émissions de gaz à effet de serre, le contrôle de la pollution atmosphérique, les changements d’usage des terres, la réponse du système Terre, les facteurs climatiques générateurs d’impacts, l’exposition, la vulnérabilité, les réponses d’adaptation, et les risques liés au climat.
Current energy projections often envision an expansion of nuclear capacities to decarbonize future energy systems. However, this contrasts with the historic and current status of the nuclear industry, marked by techno-economic challenges for both light-water and non-light-water reactor technologies. Regardless, projections of strong nuclear growth have persisted since the 1970s. This paper investigates the “nuclear energy paradox” which shows the recurring divergence between historical projections and actual developments. A data compilation of long-term energy projections from international organizations such as the IAEA and the IEA as well as energy system models like GCAM and MESSAGE, as used in the IPCC, reveal a recurring pattern of high-growth projections for nuclear power. Such projections often rest on techno-economic assumptions such as substantial cost reductions. We propose the concept of nuclear imaginaries to show that these assumptions are embedded into techno-economic visions of nuclear power de
Climate models show considerable discrepancies in their future projections around the Atlantic, mainly due to uncertainties in the fate of the Atlantic Meridional Overturning Circulation (AMOC). Climate models suggest a reduction in AMOC strength of 32 ± 37% by 2100 (90% probability, Shared Socioeconomic Pathways 2-4.5 scenario, Coupled Model Intercomparison Project Phase 6). To refine this estimate and reduce its uncertainty, we use four different observational constraint methods. The best one, which provides the lowest leave-one-out error, integrates a large set of observable variables using ridge-regularized linear regression—a method unusual in climate science. It gives an estimate of the AMOC slowdown of 51 ± 8% (90% probability), i.e., a weakening ∼ 60% stronger than suggested by the multimodel mean. This refinement mainly results from correcting a bias in South Atlantic surface salinity, consistent with recent studies emphasizing its role in the proximity to an AMOC tipping point. This more substantial
The Shift Project a publié mardi son "Plan robuste pour l'économie française", qui développe vingt "chantiers" grâce auxquels la France peut atteindre une neutralité carbone en 2050, selon le centre de réflexion. "Il y a 20 chantiers incontournables si on veut réussir la décarbonation de la France et il y a un certain nombre de conditions à aligner pour la réussir", a affirmé Clément Caudron, chef de projet "Stratégie de transition robuste" lors d'une conférence de presse.
Arthur Keller expert en risques systémiques et strategies de resilience présente les conclusions alarmantes du Shift Project et de Rystad Energy sur notre avenir énergétique. Le pétrole abondant qui a structure nos villes et notre économie mondiale entre dans une phase de déclin irreversible. Avec un taux de remplacement de seulement seize pour cent chaque baril découvert cache six barils consommes. L’Union européenne fait face a un mur d’approvisionnement des deux mille trente qui imposera des renoncements majeurs. Nous quittons l’ère du toujours plus pour entrer dans l’ère du moins.
Scenarios serve as a critical tool in climate change analysis, enabling the exploration of future evolution of the climate system, climate impacts, and the human system (including mitigation and adaptation actions). This paper describes the scenario framework for ScenarioMIP as part of CMIP7. The design process has involved various rounds of interaction with the research community and user groups at large. The proposal covers a set of scenarios exploring high levels of climate change (to explore high-end climate risks), medium levels of climate change (anchored to current policy), and low levels of climate change (aligned with current international agreements). These scenarios follow very different trajectories in terms of emissions, with some likely to experience peaks and subsequent declines in greenhouse gas concentrations in this century. An important innovation is that most scenarios are intended to be run, if possible, in emission-driven mode, providing a better representation of the Earth system uncert
Artificiële intelligentie (AI) wordt door voorstanders tegelijkertijd verkocht als een economisch wondermiddel en als existentiële bedreiging. Maar al die hype en grote statements verhullen de alledaagse en tegelijk zeer problematische realiteit.