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L’Organisation Météorologique Mondiale a publié son rapport annuel (OMM2024). L’année 2024 a été la plus chaude de l’Histoire. Elle a apporté de nombreux événements extrêmes. Le cyclone Yagi a causé des dégâts étendus en Chine, au Philippines et au Vietnam, et le cyclone Chido a dévasté Mayotte et le Mozambique. De nombreux affluents de l’Amazone se sont taris par une chaleur inhabituelle, et plus de mille pèlerins ont succombé à la chaleur à la Mecque.

Our study presents a global assessment of microplastic pollution’s impact on food security. By analyzing a comprehensive dataset of 3,286 records, we quantify the reduction in photosynthesis caused by microplastics across various ecosystems.

Countries must move rapidly to slash CO2 emissions from homes, offices, shops and other buildings—a sector that accounts for a third of global greenhouse gas pollution, the United Nations said Monday. Carbon dioxide emissions from the building sector rose around 5% in the last decade when they should have fallen 28%, according to a new report by the United Nations Environment Program (UNEP).

The clear signs of human-induced climate change reached new heights in 2024, which was likely the first calendar year to be more than 1.5°C above the pre-industrial era, with a global mean near-surface temperature of 1.55 ± 0.13 °C above the 1850-1900 average.

Global temperature leaped more than 0.4°C (0.7°F) during the past two years, the 12-month average peaking in August 2024 at +1.6°C relative to the temperature at the beginning of last century (the 1880-1920 average). This temperature jump was spurred by one of the periodic tropical El Niño warming events, but many Earth scientists were baffled by the magnitude of the global warming, which was twice as large as expected for the weak 2023-2024 El Niño.

The world is warming despite natural fluctuations from the El Niño cycle.

Theo Francken a préparé un plan de résilience si la Belgique est attaquée sur son propre sol par la Russie.

Où en est l’effort environnemental des États européens ? Les 27 États membres de l’UE se sont fixés des engagements pour réagir au changement climatique et à ses conséquences, aux problèmes de qualité de l’air qui provoquent des décès précoces, à la chute de la biodiversité.

... 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.

Les événements centennaux, vagues de chaleurs qui frappaient tous les cent ans par le passé, se produisent maintenant tous les dix ou vingt ans. Dans le futur, des épisodes plus graves, aux températures plus élevées, se produiront, et atteindront des températures fatales pour les populations. Les canicules comportent d’autres dangers qui incluent la sécheresse, la mort du bétail et les incendies.

Un nouvel article du grand climatologue James Hansen affirme que le réchauffement a accéléré il y a quelques années. La réduction des aérosols liés au fuel des navires en serait la cause. La fonte du Groenland dépasse les prévisions et mènera à un arrêt de la circulation océanique dans 20 -30 ans, ce qui provoquera plus tard une importante montée du niveau de la mer. Il suggère des prévisions climatiques complémentaires à celles du GIEC, qui s’appuieraient plus sur les observations de la réalité.

Human-driven ocean warming is increasingly overwhelming El Niño, La Niña, and other natural climate patterns.

An international group of scientists, led by King's College London, has revealed how continued global warming will lead to more parts of the planet becoming too hot for the human body over the coming decades. the amount of landmass on our planet that would be too hot for even healthy young humans (18 to 60-year-olds) to keep a safe core body temperature will approximately triple (to 6%)—an area almost the size of the US—if global warming reaches 2°C above the preindustrial average.

An engaging discussion on groundbreaking research that reveals the unexpected drivers behind the recent unprecedented rise in global temperatures. Moderated by SDSN President Professor Jeffrey Sachs, this virtual event explored Dr. James Hansen and colleagues' findings in the latest publication, “Global Warming Has Accelerated,” their implications for climate sensitivity, and the urgent need for alternative approaches to mitigate the looming "point of no return."

« Drill, baby drill » par contre, brille surtout par son absurdité. Le climat change très vite et les énergies renouvelables s’imposent trop lentement au niveau mondial. Pendant ce temps, le gaz carbonique s’accumule dans l’atmosphère, et les températures montent. Les déclarations incohérentes de Trump à ce sujet seront bientôt balayées par quelques tempêtes. Le problème du climat deviendra alors évident pour tous. En 2023, James Hansen calculait que la vitesse de changement actuelle nous menait à 2°C de température mondiale vers 2040 (voir figure ci-dessous).

A panel of international scientists has moved their symbolic “Doomsday Clock” closer to midnight than ever before, citing Russian nuclear threats amid its invasion of Ukraine, tensions in other world hotspots, military applications of artificial intelligence and the climate crisis as factors underlying the risks of global catastrophe.

Some scientists fear the risk of a collapse to warm Atlantic currents has not been taken seriously.

Génétique de fin. La diversité génétique des espèces animales et végétales baisse à l’échelle mondiale, révèle une vaste étude internationale publiée dans la revue Nature mercredi. Mais, à l’aide de stratégies de conservation adaptées, cette tendance pourrait s’inverser.

Human-caused climate change increased the likelihood and intensity of the hot, dry and windy conditions that fanned the flames of the recent devastating Southern California wildfires, a scientific study found. But the myriad of causes that go into the still smoldering fires are complex, so the level of global warming's fingerprints on weeks of burning appears relatively small compared to previous studies of killer heat waves, floods and droughts by the international team at World Weather Attribution. Tuesday's report, too rapid for peer-review yet, found global warming boosted the likelihood of high fire weather conditions in this month's fires by 35% and its intensity by 6%.

As authorities declared 2024 the hottest on record, a key private sector climate alliance, the Glasgow Financial Alliance for Net Zero (GFANZ) abandoned a requirement that members be aligned to the Paris agreement. That was followed by a network of net zero asset managers suspending work, and deleting from its website its statement of commitments that members must adopt, after BlackRock, the biggest of them all, quit its ranks.