Jean-Pascal Van Ypersele

Recent simulations using the Community Earth System Model (CESM) indicate that a tipping event of the Atlantic Meridional Overturning Circulation (AMOC) would cause Europe to cool by several degrees. This AMOC tipping event was found under constant pre-industrial greenhouse gas forcing, while global warming likely limits this AMOC-induced cooling response. Here, we quantify the European temperature responses under different AMOC regimes and climate change scenarios. A strongly reduced AMOC state and intermediate global warming (C, Representative Concentration Pathway 4.5) has a profound cooling effect on Northwestern Europe with more intense cold extremes. The largest temperature responses are found during the winter months and these responses are strongly influenced by the North Atlantic sea-ice extent. Enhanced North Atlantic storm track activity under an AMOC collapse results in substantially larger day-to-day temperature fluctuations. We conclude that the (far) future European temperatures are dependent o

J’ai l’habitude de voir les écologistes et les futurologues parler des limites de la croissance (« The Limits to Growth »). Je suis moins habitué à voir des spécialistes de l’investissement mentionner des recherches liées aux limites de la croissance. C’est pourtant ce qu’a fait récemment Joachim Klement dans sa lettre d’information quotidienne. Bien entendu, quiconque écrit sur les limites de la croissance doit d’abord procéder à toutes les vérifications d’usage. En effet, la combinaison des mots « limites » et « croissance » dans le titre a suscité un grand nombre de réactions critiques, allant de la déformation pure et simple de l’ouvrage à l’incompréhension du modèle de dynamique des systèmes qui le sous-tend.

I’m used to environmentalists and futurists writing about The Limits to Growth. I’m less used to seeing investment writers mention research that’s linked to The Limits of Growth. But that’s what Joachim Klement did in his daily newsletter recently.

I’m used to environmentalists and futurists writing about The Limits to Growth. I’m less used to seeing investment writers mention research that’s linked to The Limits of Growth. But that’s what Joachim Klement did in his daily newsletter recently. Of course, anyone who writes about Limits of Growth has to do all the usual disclaimers first. This is because the combination of the words “limits” and “growth” in the title produced a lot of critical responses, on a range from straight-up hatchet jobs which misrepresented the book, to people who didn’t appear to understand the systems dynamics model that sat behind it.

Millions of Americans rely on drinking water systems that have detected these forever chemicals at levels above the now-abandoned limits.

For hundreds of millions of people living in India and Pakistan the early arrival of summer heatwaves has become a terrifying reality that’s testing survivability limits and putting enormous strain on energy supplies, vital crops and livelihoods. Both countries experience heatwaves during the summer months of May and June, but this year’s heatwave season has arrived sooner than usual and is predicted to last longer too. Temperatures are expected to climb to dangerous levels in both countries this week.

Before you read this, a word of caution. You may want to prepare yourself a stiff drink and sit down before you read the following. I think most people who read this will at some point in their life heard about the Club of Rome’s Limit to Growth publication from the 1970s. Back then, the Club of Rome asked the MIT to produce a series of forecasts for the world’s industrial and services output, food production, and pollution levels to the year 2100. Almost from the get-go, these forecasts were derided as scaremongering and flat out wrong. But were they really?

Morgan Stanley, JPMorgan and an international banking group have quietly concluded that climate change will likely exceed the Paris Agreement’s 2 degree goal.Top Wall Street institutions are preparing for a severe future of global warming that blows past the temperature limits agreed to by more than 190 nations a decade ago, industry documents show.

Recent projections suggest that large geographical areas will soon experience heat and humidity exceeding limits for human thermoregulation. The survivability limits modeled in that research were based on laboratory studies suggesting that humans cannot effectively thermoregulate in wet bulb temperatures (Twb) above 26 to 31 °C, values considerably lower than the widely publicized theoretical threshold of 35 °C. The newly proposed empirical limits were derived from the Twb corresponding to the core temperature inflection point in participants exposed to stepped increases in air temperature or relative humidity in a climate-controlled chamber. Despite the increasing use of these thermal-step protocols, their validity has not been established. We used a humidity-step protocol to estimate the Twb threshold for core temperature inflection in 12 volunteers.

Donald Trump’s administration is to reconsider the official finding that greenhouse gases are harmful to public health, a move that threatens to rip apart the foundation of the US’s climate laws, amid a stunning barrage of actions to weaken or repeal a host of pollution limits upon power plants, cars and waterways.

💡 Is our obsession with economic growth leading us to collapse? Economist and research Gaya Herrington joins us to discuss why GDP is a flawed metric, how degrowth can lead to a thriving well-being economy, and why businesses must prioritize resilience over efficiency. Tune in for a critical conversation on reshaping our economic future.

The abrupt loss of many species from a system is generally attributed to a breakdown in ecological functioning. As species are sequentially knocked out, the whole community becomes unstable, and it all comes crashing down. Another mechanism that may be at play. My colleagues and I argue that despite the fact life on Earth displays such great variety, many species that live together appear to share remarkably similar thermal limits. That is to say, individuals of different species can tolerate temperatures up to similar points.

After 50 years, there is still an ongoing debate about the Limits to Growth (LtG) study. This paper recalibrates the 2005 World3-03 model. The input parameters are changed to better match empirical data on world development. An iterative method is used to compute and optimize different parameter sets. This improved parameter set results in a World3 simulation that shows the same overshoot and collapse mode in the coming decade as the original business as usual scenario of the LtG standard run. The main effect of the recalibration update is to raise the peaks of most variables and move them a few years into the future. The parameters with the largest relative changes are those related to industrial capital lifetime, pollution transmission delay, and urban-industrial land development time.

Recent news articles about a breakthrough in nuclear fusion research heralded the potential for “limitless” energy. Whenever I read that word limitless I wince, because I’ve learned to view it as a subtle instruction to readers to “please stop thinking now.” After decades of false promises to delive

conférence de Dennis Meadows, analyste des systèmes, initiateur et co-auteur du rapport Les limites de la croissance, Club de Rome, 1972 lundi 19 septembre 2022 ENS de Lyon, amphithéâtre Mérieux

Le rapport Meadows est le livre fondateur des actions de transition écologique. En voici un résumé destiné aux lycéens.

The 1972 book "The Limits to Growth" shared a somber message for humanity: the Earth's resources are finite and probably cannot support current rates of economic and population growth to the end of the 21st century, even with advanced technology. Although disparaged by economists at the time, it turns out that, 50 years later, the message still deserves our attention.

We have reviewed the first two chapters of the new book Limits and Beyond. The reviews can be found at The Yawning Gap (Chapter 1) and No More Growth (Chapter 2). In this post we take a look at the third chapter, written by Dennis Meadows, a co-author of the original Limits to Growth. Dr. Meadows reports that he has delivered over a thousand speeches to a very wide variety of audiences. In this chapter the author summarizes “19 of the most common questions, comments and objections” that he has received over the years. Some of his insights are as follows:

The book Limits and Beyond, edited by Ugo Bardi and Carlos Alwarez Pereira, provides a 50th anniversary review of the seminal report Limits to Growth (LtG). The following is from the back cover of the book. 50 years ago the Club of Rome commissioned a report: Limits to Growth. They told us that, on our current path, we are heading for collapse in the first half of the 21st century. This book, published in the year 2022, reviews what has happened in the intervening time period. It asks three basic questions:

In 1972, a book changed the world. The Club of Rome commissioned a report that shifted how we see what humans are doing to the planet. Looking back five decades later, what happened next, what did we do and not do, what did we learn, and what happens now? In The Limits to Growth, a team from MIT studied the way humans were using the resources of the earth. Using sophisticated computer modelling, the researchers developed scenarios to map out possible paths for humanity, the global economy and the impact on the planet.

Presentation of the book "Beyond the Limits," a new report to the Club of Roma edited by Ugo Bardi and Carlos Alvarez Pereira. It tells the story of the 1972 study "The Limits to Growth" and its relevance 50 years later.

Au début des années 1970, le club de Rome1 s’interroge sur la pérennité de la croissance dans un mode fini. Il confie une étude au Massachusetts Institute of Technology (MIT). Une équipe de recherche, emmenée par Dennis Meadows2, conçoit une modélisation du système socio-économique humain et de ses interactions avec la planète : le modèle World3. En 1972 paraît The Limits to Growth (Les limites à la croissance). Ce rapport, qui montre que la croissance a des limites, et que sa poursuite au-delà conduirait à l’effondrement du système, fait grand bruit.

Researchers must try to resolve a dispute on the best way to use and care for Earth’s resources. Fifty years ago this month, the System Dynamics group at the Massachusetts Institute of Technology in Cambridge had a stark message for the world: continued economic and population growth would deplete Earth’s resources and lead to global economic collapse by 2070. This finding was from their 200-page book The Limits to Growth, one of the first modelling studies to forecast the environmental and social impacts of industrialization.

En 1972 paraissait un rapport scientifique qui fit l’effet d’une bombe. Le rapport Meadows, intitulé « The limits to growth », annonçait pour la première fois au monde les limites physiques de la croissance économique. Sa conclusion est formelle : la persistance du modèle de société actuel et l’épuisement des ressources qui en découle conduit inévitablement à un « crash » dramatique au cours du XXIe siècle. Pourtant, 50 ans plus tard rien ne semble avoir changé. Dans le podcast Dernières Limites, la journaliste Audrey Boehly fait le point en interrogeant des experts et des scientifiques de la question. Quelle marge de manœuvre nous reste-il pour inverser la tendance ? Quel avenir est encore possible à la lumière des ressources disponibles et des enjeux écologiques à venir ? Entretien.

The Working Group II contribution to the IPCC Sixth Assessment Report assesses the impacts of climate change, looking at ecosystems, biodiversity, and human communities at global and regional levels. It also reviews vulnerabilities and the capacities and limits of the natural world and human societies to adapt to climate change.

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Only rarely does a book truly change the world. In the nineteenth century, such a book was Charles Darwin’s On the Origin of Species. For the twentieth century, it was The Limits to Growth. Not only did this best-selling 1972 publication help spur the environmental movement, but it showed that the underlying dynamics of the modern industrial world are unsustainable on the timescale of a couple of human lifetimes. This was profoundly important information, and it was delivered credibly and clearly, so that every policy maker could understand it.

Il y a 50 ans Dennis Meadows co-publiait le rapport « Meadows ». Ce rapport est aussi appelé rapport du Club de Rome, ou « limits to growth ». Il dit en bref qu’une croissance infinie dans un monde fini n’est pas possible et que tôt ou tard, nous allons atteindre des limites physiques et commencer à décroître. Et d’après les modélisations de l’époque, ce « tôt ou tard » arrive autour de 2030…

L’auteur du fameux rapport « The Limits To Growth » fait le point, 50 ans après…

Today, the European Court of Justice stated that EU energy companies will no longer be allowed to sue EU governments using the Energy Charter Treaty – throwing into doubt a number of ongoing billion-euro arbitrations.

Almost five decades after the Meadows report ( Club of Rome ) , the incredible accuracy of the forecasts of the World3 model – a computer simulation programme – are an unparalleled milestone in terms of scientific anticipation.

Dans une Amérique à peine sortie des Golden Sixties et pas encore tout à fait dans la première crise pétrolière, ce livre, également connu sous le nom de "Rapport Meadows", fut d’abord taxé de catastrophiste et fit l’objet de nombreuses controverses (ce qui ne l’empêcha pas de devenir un best-seller). Les projections présentes dans "The limits to growth" étaient pourtant loin des prédictions apocalyptiques ésotériques très en vogue à l’époque. Ces projections étaient le résultat d’une modélisation tout ce qu’il y a de plus scientifique et sérieux.

In the 1972 bestseller Limits to Growth(LtG), the authors concluded that if humanity kept pursuing economic growth without regard for environmental and socialcosts, global society would experience as harpdecline(i.e.,collapse) in economic, social, and environmental conditions within thetwenty-firstcentury.

Ces dernières décennies sont marquées par la crainte d’un déclin de notre civilisation telle que nous la connaissons, alors même que les progrès technologiques et industriels semblent exponentiels. La surpopulation et la surconsommation placent les générations actuelles dans une véritable impasse. En 1972, une équipe de scientifiques du MIT a publié une étude prédisant la fin de ce que l’on appelle la « civilisation industrielle » au cours du 21e siècle, et ces prédictions semblent aujourd’hui totalement en phase avec la réalité, selon une nouvelle étude.

A 1972 MIT study predicted that rapid economic growth would lead to societal collapse in the mid 21st century. A new paper shows we’re unfortunately right on schedule.

Even “sustainable” technologies such as electric vehicles and wind turbines face unbreachable physical limits and exact grave environmental costs

En 1972 sort "The limits to growth" un livre dans lequel trois scientifiques du MIT avertissent le monde des conséquences probables d'un développement humain basé sur le productivisme sur une planète aux ressources finies. Le livre devient un best seller et une référence pour tous les aficionados de la théorie de l'effondrement.

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Après un rapide résumé du contexte dans lequel l’étude «Limits to Growth» a été menée, Meadows en rappelle la conclusion principale. Il était indiqué que si les politiques mises en œuvre dans les années 70 persistaient, le monde connaîtrait une croissance jusqu’aux alentours de 2020 et ensuite un déclin. Sur les 13 scénarios développés, c’est celui de «l’overshoot» (dépassement) qui a prévalu. Nous sommes donc au début de la phase de déclin.

Dennis Meadows: The notion that there is some kind of fairly attractive sustainable society ahead of us if we can only find it is now a fantasy. The global population, its use of materials, its generation of wastes has grown so far above the sustainable capacity of the planet that there is nothing ahead [of the kind] that the sustainable utopia people are talking about.