Jean Jouzel

L'administration Trump a annoncé vendredi la "suppression immédiate" de 400 millions de dollars de subventions fédérales à l'université privée new-yorkaise Columbia, épicentre des manifestations pro-palestiniennes au printemps 2024, qu'elle accuse d'inaction face "à des actes antisémites".

Solvay surfe sur la vague de la transition écologique pour augmenter les capacités de ses usines et continuer à fabriquer des PFAS à destination des batteries de véhicules électriques. Malgré les différents scandales environnementaux dans lequel le groupe belge est impliqué, une enquête réalisée en collaboration avec The Examination, le Post and Courier et Columbia Investigation Journalism révèle que l’industriel est loin d’avoir renoncé à ces substances.

Global warming is accelerating because the drive for warming, Earth’s energy imbalance, has doubled in the past decade. Measurement of the acceleration is hampered by unforced tropical (El Nino/La Nina) variability, but a good measuring stick is provided by warming between successive large El Ninos. Strengthening of the current (2023-24) El Nino has raised it to a level similar to the 1997-98 and 2015-16 El Ninos. The first six months of the current El Nino are 0.39°C warmer than the same six months of the 2015-16 El Nino, a global warming rate of 0.49°C/decade, consistent with expectation of a large acceleration of global warming. We expect the 12-month mean temperature by May 2024 to eliminate any doubt about global warming acceleration. Subsequent decline of the 12-month temperature below 1.5°C will likely be limited, confirming that the 1.5°C limit has already been passed.

A coalition of British Columbians are organizing their municipalities to take oil and gas companies to court over the costs of the climate crisis

Simultaneous harvest failures across major crop-producing regions are a threat to global food security. Concurrent weather extremes driven by a strongly meandering jet stream could trigger such events, but so far this has not been quantified. Specifically, the ability of state-of-the art crop and climate models to adequately reproduce such high impact events is a crucial component for estimating risks to global food security. Here we find an increased likelihood of concurrent low yields during summers featuring meandering jets in observations and models. While climate models accurately simulate atmospheric patterns, associated surface weather anomalies and negative effects on crop responses are mostly underestimated in bias-adjusted simulations. Given the identified model biases, future assessments of regional and concurrent crop losses from meandering jet states remain highly uncertain. Our results suggest that model-blind spots for such high-impact but deeply-uncertain hazards have to be anticipated and acc

L’actualisation de précédents travaux par des chercheurs de l’Université Columbia et de l’Université de Californie (États-Unis) soutient que la sécheresse qui touche le sud-ouest de l’Amérique du Nord depuis une vingtaine d’années est la plus sévère depuis au moins 1200 ans. Les résultats ont été publiés dans la revue Nature Climate Change ce 14 février.

A just-published study coins a new metric: the "mortality cost of carbon." That is, how many future lives will be lost—or saved—depending on whether we increase or decrease our current carbon emissions. If the numbers hold up, they are quite high. The study was published today in the journal Nature Communications.

Current methods to calculate the so-called social cost of carbon largely leave out how many future people our emissions will kill. This study tries to correct that.

Global temperature in June was +1.13°C (relative to the 1880-1920 base period, which is our best estimate of preindustrial temperature); it was +0.85°C relative to the 1951-1980 base period. High temperature anomalies were notable in northwest North America, northeast Siberia, and a horseshoe-shaped area covering much of Europe and western Asia (Fig. 1). The Pacific Northwest heatwave continued into July with daily temperatures exceeding prior records by several degrees, an extreme that merits discussion.

Editor’sNote: This essay by esteemed scientist James Hansen is a hybrid ofthe books’ foreword and an independent treatise on the accelerated warming of the planet