Flux continu

Et si la prochaine crise alimentaire mondiale n’était pas due à un manque de terres cultivables, mais à un manque de bras pour les cultiver ? Une étude du KAIST publiée dans Nature Sustainability intègre pour la première fois la démographie rurale dans les modèles de sécurité alimentaire — et les résultats sont plus préoccupants que prévu.

The Ocean is essential to life on Earth, regulates the climate, supports rich biodiversity, sustains livelihoods, and inspires cultures and societies. However, unregulated human impacts are putting the Ocean and its ability to contribute to humanity at risk. The Starfish Barometer is a new initiative launched on World Ocean Day (8 June 2025) to provide a concise, science-based annual overview of the multiple dimensions of the Ocean through the lens of its interdependence with humanity. Each year, the Starfish Barometer will present a carefully curated selection of Ocean-related developments, chosen for their global significance and grounded in the most up-to-date scientific evidence, intended for a broad non-specialist audience. Rather than offering an exhaustive review, it will spotlight key aspects, robust, evidence-based, and reflective of major developments of the year. The Starfish Barometer emphasizes the two-way relationship between humanity and the Ocean: we impact its future, and it shapes ours. Its

Climate change is causing measurable harm globally1,2. Political and legal efforts seek to link these damages with specific emissions, including in discussions of loss and damage (L&D)3,4; however, no quantitative definition of L&D exists5,6, nor is there a framework to link past and future emissions from specific sources to monetized, location-specific damages. Here we develop such a framework, which is integrated with recent efforts to estimate the social cost of carbon7. Using empirical estimates of the non-linear relationship between temperature and aggregate economic output, we show that future damages from past emissions—one component of L&D—are at least an order of magnitude larger than historical damages from the same emissions. For instance, one tonne of CO2 emitted in 1990 caused US$180 in discounted global damages by 2020 ($40–530) and will cause an additional $1,840 through 2100 ($500–5,700). Thus, settling debts for past damages will not settle debts for past emissions. In other illustrative esti

As climate change accelerates, its effects are being felt in every corner of the world. A comprehensive global index developed by researchers at the University of Notre Dame has assessed the climate vulnerability and adaptive readiness of nearly 200 countries, revealing stark and troubling disparities between the world’s wealthiest and most impoverished nations.

The Physics of Sustainability – 25/12/2026 - (*The Physics of Sustainability: Material and Power Constraints for the Long Term* – [https://lnkd.in/eMHZ_zvS](https://lnkd.in/eMHZ_zvS)) - À partir de notre article scientifique co-écrit avec plusieurs collègues, qui propose une analyse systémique à l’échelle planétaire en synthétisant plus de 50 ans de résultats (énergie, cycles biogéochimiques, ressources, limites), voilà ce qui change vraiment le cadre. - Le grand malentendu : croire que la soutenabilité se résume à « décarboner ». En réalité, la transition n’est pas seulement une affaire de carbone ni de technologies. L’énergie est avant tout un problème de métabolisme : celui de nos sociétés, de leurs flux matériels, de leurs rythmes et de leurs limites. Sans repenser ce métabolisme, on ne fait que créer des solutions “zombies” : techniquement séduisantes, mais écologiquement et physiquement intenables à long terme.

Much of today's sustainability discourse emphasizes efficiency, clean technologies, and smart systems, but largely underestimates fundamental physical constraints relating to energy-matter interactions. These constraints stem from the fact that Earth is a materially closed yet energetically open system, driven by the sustained but low power-density flux of solar radiation. This Perspective reframes sustainability within these axiomatic limits, integrating relevant timescales and orders of magnitude. We argue that fossil-fueled industrial metabolism is inherently incompatible with long-term viability, while post-fossil systems are surface-, materials-, and power-intensive. Long-term sustainability must therefore be defined not only by how much energy or material is used, but also by how it is used: favoring organic, carbon-based chemistry with limited reliance on purified metals, operating at low power density, and maintaining low throughput rates. Achieving this requires radical technological shifts toward l

Vaccination, despite being recognized as one of the most effective primary public health measures, is viewed as unsafe and unnecessary by an increasing number of individuals. Anxiety about vaccines and vaccination programs leading to vaccine hesitancy results from a complex mix of social and political influences, cultural and religious beliefs, the availability of and ability to interpret health and scientific information, and personal and population experiences of health systems and government policies. Vaccine hesitancy is becoming a serious threat to vaccination programs, and was identified as one of the World Health Organization’s top ten global health threats in 2019. The negative impact of anti-vaccination movements is frequently cited as one of the major reasons for rising vaccine hesitancy amongst the general public world-wide. This review discusses the various issues surrounding vaccine hesitancy and the anti-vaccine movement, starting with the definitions of vaccine hesitancy and the anti-vaccine mo

Four key parts of the Earth’s climate system are destabilising, according to a new study with contributions from the Potsdam Institute for Climate Impact Research (PIK). Researchers analysed the interconnections of four major tipping elements: the Greenland ice sheet, the Atlantic meridional overturning circulation (AMOC), the Amazon rainforest and the South American monsoon system. All four show signs of diminished resilience, raising the risk of abrupt and potentially irreversible changes.

The main report provides an integrated narrative, examining the central and vital role that the climate and natural environment play in ensuring health, resilience and prosperity for people, anchored in the EU’s vision for a sustainable Europe by 2050.

Passing 1.5ºC is now inevitable. Overshoot scenarios tell us that we can relatively safely pass this level but then bring temperatures back down again, but how realistic are they, and how safe?