Flux continu

La cryptomonnaie a atteint son cours le plus bas depuis seize mois. François Villeroy de Galhau appelle à «fuir» les conseillers financiers qui le présentent comme un placement sûr.

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

Le "tout tout de suite" est la nouvelle norme qui régit nos comportements. Mais la riposte s'organise.

... An “acid” test of our interpretation will be provided by the 2025 global temperature: unlike the 1997-98 and 2015-16 El Ninos, which were followed by global cooling of more than 0.3°C and 0.2°C, respectively, we expect global temperature in 2025 to remain near or above the 1.5°C level. Indeed, the 2025 might even set a new record despite the present weak La Nina. There are two independent reasons. First, the “new” climate forcing due to reduction of sulfate aerosols over the ocean remains in place, and, second, high climate sensitivity (~4.5°C for doubled CO2) implies that the warming from recently added forcings is still growing significantly.

Met de opwarming van de aarde stijgt ook de behoefte aan duurzame manieren om gebouwen te koelen. Onderzoekers van UCLA hebben nu een betaalbare én schaalbare techniek ontwikkeld om huizen en andere gebouwen in de zomer te koelen en in de winter te verwarmen, met behulp van alledaagse bouwmaterialen.

Aurore Stéphant est ingénieure géologue minier, spécialisée dans les risques environnementaux et sanitaires de l'industrie minière. Elle est cofondatrice de l'association SystExt(Systèmes extractifs et Environnements) qui regroupe des professionnels en activité ayant un intérêt commun pour les systèmes extractifs, en particulier miniers, et des compétences pour s'approprier les problématiques techniques associées à ces activités. Nous avons discuté de ce qu'est l'industrie minière et les particularités liés aux métaux nécessaires au numérique.

Hoe maken we in de toekomst nog medicijnen, bouwmaterialen, textiel of verpakkingsmaterialen als we geen fossiele grondstoffen meer gebruiken? Er bestaan al veel alternatieven, maar die kunnen vaak nog niet gebruikt worden. Gelukkig kunnen slimme computerprogramma’s ons helpen.

A novel methodology is developed to dynamically assess the energy and material investments required over time to achieve the transition from fossil fuels to renewable energy sources in the electricity sector. The obtained results indicate that a fast transition achieving a 100% renewable electric system globally by 2060 consistent with the Green Growth narrative could decrease the EROI of the energy system from current ~12:1 to ~3:1 by the mid-century, stabilizing thereafter at ~5:1. These EROI levels are well below the thresholds identified in the literature required to sustain industrial complex societies. Moreover, this transition could drive a substantial re-materialization of the economy, exacerbating risk availability in the future for some minerals. Hence, the results obtained put into question the consistence and viability of the Green Growth narrative.

Bart De Wever schreef in zijn boek over woke dat het ‘onze cultuur vernietigt’ of ‘het water waarin we ons bevinden vergiftigt’. Maar als je vraagt wat woke precies is, blijft het antwoord meestal uit, schrijft sociaal-econoom Emmanuel O. Iyamu. Wat betekent woke nu echt?

De wereldwijde overschakeling op groene energie doet de vraag naar een aantal cruciale grondstoffen enorm stijgen. Europa is voor deze grondstoffen grotendeels afhankelijk van import uit andere landen. Met de Critical Raw Materials Act wil de EU die afhankelijkheid bijsturen.