Justice & Paix

Dans le World Energy Outlook 2025 de l’Agence internationale de l’énergie (AIE) rendu public ce 12 novembre(1), le « Current Policies Scenario » (CPS), tombé en disgrâce en 2019, refait surface. Ce scénario suppose la pleine application des « politiques et régulations déjà en place ». C’est un scénario de triomphe de l’Amérique trumpienne : le pétrole et le gaz dominent encore le système énergétique en 2050 ; les émissions de CO2 diminuent à peine d’ici 2050 ; la température mondiale n’est pas stabilisée avant la fin du siècle.

Scientists say ‘shocking’ discovery shows rapid cuts in carbon emissions are needed to avoid catastrophic fallout

The vast ice of Antarctica has long seemed impregnable. But sudden changes are arriving – from shrinking sea ice to melting ice sheets and slowing ocean currents.

You are some of the leading reporters and editors who have covered the Netanyahu genocidal mass murder and mayhem in Gaza. This important plea asserts that you all know better than to rely only on the extensive understatement of the deaths and serious injuries put forward by Hamas. You need to DO BETTER for your readers by digging deeper into the much higher estimates of deaths by experts in disaster casualties. Eye-witness accounts which do not support the Hamas undercount.

Sascha is a U.K.-based staff writer at Live Science. She holds a bachelor’s degree in biology from the University of Southampton in England and a master’s degree in science communication from Imperial College London. Her work has appeared in The Guardian and the health website Zoe. Besides writing, she enjoys playing tennis, bread-making and browsing second-hand shops for hidden gems.

We investigate the probabilities of triggering climate tipping points under five Shared Socioeconomic Pathways (SSPs) and how they are altered by including the additional carbon emissions that could arise from tipping points within the Earth's carbon cycle. The crossing of a climate tipping point at a threshold level of global mean surface temperature (threshold temperature) would commit the affected subsystem of the Earth to abrupt and largely irreversible changes with negative impacts on human well-being. However, it remains unclear which tipping points would be triggered under the different SSPs due to uncertainties in the climate sensitivity to anthropogenic greenhouse gas emissions, the threshold temperatures and timescales of climate tipping points, and the response of tipping points within the Earth's carbon cycle to global warming. We include those uncertainties in our analysis to derive probabilities of triggering for 16 previously identified climate tipping points within the Earth system.

Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050?

The Antarctic Circumpolar Current (ACC) is the world's strongest ocean current and plays a disproportionate role in the climate system due to its role as a conduit for major ocean basins. This current system is linked to the ocean's vertical overturning circulation, and is thus pivotal to the uptake of heat and CO2 in the ocean. The strength of the ACC has varied substantially across warm and cold climates in Earth's past, but the exact dynamical drivers of this change remain elusive. This is in part because ocean models have historically been unable to adequately resolve the small-scale processes that control current strength. Here, we assess a global ocean model simulation which resolves such processes to diagnose the impact of changing thermal, haline and wind conditions on the strength of the ACC. Our results show that, by 2050, the strength of the ACC declines by ∼20% for a high-emissions scenario. This decline is driven by meltwater from ice shelves around Antarctica, which is exported to lower latit

Pour développer l’intelligence artificielle en France, 109 milliards d’euros seront investis, a annoncé dimanche soir le chef de l’État. Une façon de placer le pays dans la course des grandes puissances au sein de ce secteur en pleine croissance, alors que s’ouvre à Paris le sommet sur l’IA qui réunit dirigeants politiques et économiques du monde entier.

L ‘entreprise tricolore d’IA a rendu son agent conversationnel - «Le Chat» - disponible en version application mobile jeudi 6 février, sur Apple et Androïd.

The Atlantic Ocean's most vital ocean current is showing troubling signs of reaching a disastrous tipping point. Oceanographer Stefan Rahmstorf tells Live Science what the impacts could be.

The network of Atlantic ocean currents keeping the Earth's climate stable are far closer to collapse than first estimated, scientists warn.

AMOC collapse would bring severe global climate repercussions, with Europe bearing the brunt of the consequences.

Le record de production de pétrole réalisé par le géant américain ExxonMobil, notamment grâce au rachat plus fructueux que prévu de Pioneer, lui a permis d'échapper au destin de ses grands concurrents mondiaux dont les résultats ont été plombés par des marges de raffinage rognées.

Several studies in recent years have suggested the crucial system — the Atlantic Meridional Overturning Circulation, or AMOC — could be on course for collapse, weakened by warmer ocean temperatures and disrupted saltiness caused by human-induced climate change. But the new research, which is being peer-reviewed and hasn’t yet been published in a journal, uses a state-of-the-art model to estimate when it could collapse, suggesting a shutdown could happen between 2037 and 2064.

For many of us the climate crisis mainly calls to mind rising global temperatures, but the crisis goes far beyond this – we are at risk of pushing our planet across climate ‘tipping points,’ critical thresholds where small changes can lead to abrupt and irreversible shifts in the Earth’s climate system. One major element in climate tipping is a huge system of ocean currents, the Atlantic Meridional Overturning Circulation (AMOC), which is responsible for Europe's relatively mild climate. Past climate patterns show that these currents can switch abruptly between today’s vigorous flow and a much weaker flow state. A future shutdown would have potentially devastating consequences in Europe and around the world.

An international team of scientists has warned against relying on nature providing straightforward 'early warning' indicators of a climate disaster, as new mathematical modeling shows new fascinating aspects of the complexity of the dynamics of climate. It suggests that the climate system could be more unpredictable than previously thought.

A crucial system of ocean currents may already be on course to collapse, according to a new report, with alarming implications for sea level rise and global weather — leading temperatures to plunge dramatically in some regions and rise in others. Using exceptionally complex and expensive computing systems, scientists found a new way to detect an early warning signal for the collapse of these currents, according to the study published Friday in the journal Science Advances. And as the planet warms, there are already indications it is heading in this direction.

Disruption of the Atlantic Meridional Overturning Current could freeze Europe, scorch the tropics and increase sea level rise in the North Atlantic. The tipping point may be closer than predicted in the IPCC’s latest assessment.

Après une annonce il y a quelques semaines, Google lance enfin son concurrent de ChatGPT. Mais Bard va devoir faire ses preuves.

Les concurrents d'EDF ont demandé pour 2023 plus d'électricité nucléaire à bas prix produite par l'opérateur historique qu'ils ne peuvent en obtenir, a annoncé jeudi la Commission de régulation de l'énergie (CRE). Le mécanisme baptisé Arenh ("accès régulé à l'électricité nucléaire historique") oblige EDF à vendre un quota annuel d'électricité nucléaire à ses concurrents au prix de 42 euros le MWh, soit actuellement beaucoup moins que sur les marchés, où les cours se sont envolés.

La capitale, qui n’est aujourd’hui pas prête à faire face aux vagues de chaleur récurrentes, tente d’accélérer la plantation d’arbres, la rénovation du bâti et la débitumisation. « Ce n’est ni une prophétie, ni une intuition, ni une hypothèse », prévient un élu écologiste.

Three former UN climate heads say gap between government promises and actions will change environment irreversibly

The Gulf Stream has weakened substantially in the past decades, as revealed by the latest data and new studies. Weather in the United States and Europe depends strongly on this ocean current, so it’s important we understand the ongoing changes and what they mean for our weather now and in the near future.

At the beginning of nearly every war including the current one in Ukraine, there are those who loudly declare that it will be over shortly and then business-as-usual can resume. They are rarely right. While no one can say for certain what the trajectory of the Russian-Ukrainian conflict will be, the economic warfare that is going on alongside it is very likely to destroy the current global trading system.

If there’s one thing we know about climate breakdown, it’s that it will not be linear, smooth or gradual. Just as one continental plate might push beneath another in sudden fits and starts, causing periodic earthquakes and tsunamis, our atmospheric systems will absorb the stress for a while, then suddenly shift. Yet, everywhere, the programmes designed to avert it are linear, smooth and gradual.

The Gulf Stream has weakened substantially in the past decades, as new data and studies show. Weather in the United States and Europe depends strongly on this ocean current, so it’s important we understand the ongoing changes and what they will mean for our weather in the future.

If Earth had a pulse, it might be The Atlantic Meridional Overturning Circulation (AMOC) – a swirl of ocean currents that carries tropical heat north towards polar waters. Over the past century this global heartbeat has eased, slowing to a speed not seen in more than a millennium. New research based on a range of indices has now bolstered views that the weakening isn't a trivial one, and critical transition is imminent.

The Atlantic Ocean's current system, an engine of the Northern Hemsiphere's climate, could be weakening to such an extent that it could soon bring big changes to the world's weather, a scientific study said on Thursday.

While the climate crisis has dominated the airwaves for a while now, the biodiversity crisis is at least as serious. Actually, these are multiple, interconnected crises, stemming from age old systemic failings. In 2019, scientific body IPBES brought to the fore the urgent need for “transformative change” to prevent biodiversity collapse, which would be disastrous for people and planet. As one example, the global coronavirus pandemic has tragically highlighted the risks of ecosystem loss for global public health. In a bid to find an answer to this crisis, the United Nations Convention on Biological Diversity (CBD) is discussing a Global Biodiversity Framework (GBF) - effectively how to ‘save’ nature.

A new study has found that if greenhouse gas emissions are not curbed urgently, a third of endemic species on land and half in the sea will become extinct, causing a collapse of biodiversity. According to the study, 92% of all endemic species on land and 95% of those in the ocean will decrease in numbers or even disappear under current emissions levels, which will increase global temperatures by 3 degrees Celsius by 2100.

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L’un des défis les plus pressants pour l’Afrique est de parvenir à satisfaire la demande alimentaire nouvelle qu’implique sa croissance démographique. En 2050, la population sur le continent sera en effet deux fois et demie plus nombreuse qu’aujourd’hui. Une évolution qui risque de confronter le développement agricole et les systèmes alimentaires des pays d’Afrique subsaharienne à des défis considérables.

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