Veille 2.1

Le Brexit, la toute-puissance de la Big Tech, les cryptomonnaies, les fake news et même la hausse des prix du café : tout s’explique par le “quantitative easing”, affirme “The New Statesman”. L’hebdomadaire britannique choisit de faire sa une sur les risques et les limites de cette politique monétaire.

Terrestrial ecosystems have taken up about 32% of the total anthropogenic CO2 emissions in the past six decades1. Large uncertainties in terrestrial carbon–climate feedbacks, however, make it difficult to predict how the land carbon sink will respond to future climate change2. Interannual variations in the atmospheric CO2 growth rate (CGR) are dominated by land–atmosphere carbon fluxes in the tropics, providing an opportunity to explore land carbon–climate interactions3–6. It is thought that variations in CGR are largely controlled by temperature7–10 but there is also evidence for a tight coupling between water availability and CGR11. Here, we use a record of global atmospheric CO2, terrestrial water storage and precipitation data to investigate changes in the interannual relationship between tropical land climate conditions and CGR under a changing climate. We find that the interannual relationship between tropical water availability and CGR became increasingly negative during 1989–2018 compared to 1960–1989

Mobil idées. Alors que s’ouvre cette semaine le Mondial de l’auto à Paris, le Réseau action climat (RAC) propose 19 mesures pour changer notre modèle en matière de mobilité et tourner le dos à l’auto dans le respect de la justice sociale.