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> Ozone layer recovery is on track, helping avoid global warming by 0.5°C https://www.unep.org/news-and-stories/press-release/ozone-layer-recovery-track-helpin

• metaphor 2y ago
  Press release circa Jan 2023...based on a 2022 report[1]...apparently leaning into datasets spanning 2000-2020...which, to be fair, buries the following lede (my emphasis): >> The use of aerosols other than sulfate is expected to change the effects on ozone via changes in heterogeneous chemistry and dynamics and transport. Comprehensive climate model simulations to quantify these effects have yet to be performed. Other aerosol types that absorb less solar radiation would heat the tropical lower stratosphere much less than sulfate. They are also potentially more chemically inert and less impactful on stratospheric ozone. Materials that have been considered include calcium carbonate, titanium dioxide, aluminum oxide, and diamond. The effects on ozone are less certain for these alternate materials owing to the paucity of laboratory and modeling studies investigating them and the lack of natural analogs. Gotta make you wonder how many Starlink satellites were in orbit back then, and did anyone anticipate the scale that SpaceX would be deploying/decommissioning them looking forward? [1] https://ozone.unep.org/system/files/documents/Scientific-Assessment-of-Ozone-Depletion-2022-Executive-Summary.pdf https://ozone.unep.org/system/files/documents/Scientific-Ass...