Jean-Pascal Van Ypersele

Global energy and materials are essential to the functioning of the economy and have significant implications for macroeconomics and the environment. At the same time, the world is not on track to meet Paris Agreement goals. This paper documents two stylized facts that connect these observations. First, the world economy is characterized by large embedded emissions and materials: different energies and materials are deeply entwined and interdependent. This has historically led to additive – rather than substitution – dynamics in energy and materials on a global scale. Second, historically there has been a strong positive correlation between efficiency in resource use and total resource use at a global scale. We synthesize these observations by introducing the Generalized Jevons Paradox (GJP). We argue that the GJP reflects the direct and indirect energy/material demand effects of long-term energy and material interdependencies, themselves shaped by market and geoeconomic power, trade arrangements, and financi

For most of the modern era, capitalism justified itself through growth. Industrial societies converted vast amounts of fossil energy into production, wealth, and rising living standards. Roads, bridges, power grids, schools, and public institutions expanded alongside the economy. Inequality and exploitation remained deeply embedded in the system, but they were partly obscured by a broader story of material progress.

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.

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

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

... 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.

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.

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.