Flux continu

The Gulf Stream is part of the Atlantic Meridional Overturning Circulation (AMOC). The AMOC is a tipping element and may collapse under changing forcing. However, the role of the Gulf Stream in such a tipping event is unknown. Here, we investigate the link between the AMOC and Gulf Stream using a high-resolution (0. 1°) stand-alone ocean simulation, in which the AMOC collapses under a slowly-increasing freshwater forcing. AMOC weakening gradually shifts the Gulf Stream near Cape Hatteras northward, followed by an abrupt northward displacement of 219 km within 2 years. This rapid shift occurs a few decades before the simulated AMOC collapse. Satellite altimetry shows a significant (1993–2024, p < 0.05) northward Gulf Stream trend near Cape Hatteras, which is also confirmed in subsurface temperature observations (1965–2024, p < 0.01). These findings provide indirect evidence for present-day AMOC weakening and demonstrate that abrupt Gulf Stream shifts can serve as early warning indicator for AMOC tipping.

The US was an oligarchy well before Trump’s first term. Recognizing this reality is essential to building a true democracy

Olivier De Schutter says new economic agenda needed to tackle crises of rising inequality and ecological collapse

I know it’s almost impossible to turn your eyes away from the Trump show, but that’s the point. His antics, ever-grosser and more preposterous, are designed to keep him in our minds, to crowd out other issues. His insatiable craving for attention is a global-threat multiplier. You can’t help wondering whether there’s anything he wouldn’t do to dominate the headlines.

States and financial bodies using modelling that ignores shocks from extreme weather and climate tipping points

Global biodiversity loss, ecosystem collapse and national security - A national security assessment

Ecosystem destruction will increase food shortages, disorder and mass migration, with effects already being felt

Notre ami Luke Kemp, chercheur au Centre pour l'étude du risque existentiel à l'Université de Cambridge (UK), a publié le livre Goliath’s Curse, the History and Future of Societal Collapse (Penguin, July 2025, 580 pages), qui sera édité en français par Albin Michel au printemps 2026. Cette « malédiction de Goliath » est le meilleur livre sur l’effondrement systémique mondial depuis dix ans, tant par la vision multidisciplinaire qu’il présente que par sa complétude et par son érudition.

Perception, pattern-seeking, and the role of neurodivergence in a failing civilisation

Mon essai précédent explorait pourquoi certaines personnes perçoivent l’effondrement plus tôt que d’autres. Celui-ci pose une autre question : si l’effondrement ne peut pas être évité, à quoi sert réellement une prise de conscience précoce ?