German newspaper article about Paul Crutzen and his ozone research.

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Visioni, D.; MacMartin, D.; Kravitz, B.; Tilmes, S.; Mills, M.; Richter, J.; Boudreau, M. (2019): Seasonal Injection Strategies for Stratospheric Aerosol Geoengineering. In: Geophys. Res. Lett. 124 (6), S. 7. DOI: 10.1029/2019GL083680.

"Simulations of stratospheric aerosol geoengineering have typically considered injections at a constant rate over the entire year. [...] We simulated single‐point injections of the same amount of SO₂ in each of the four seasons and at five different latitudes (30°S, 15°S, equator, 15°N, and 30°N), 5 km above the tropopause. Our findings suggest that injecting only during one season reduces the amount of SO₂ needed to achieve a certain aerosol optical depth, thus potentially reducing some of the side effects of geoengineering. We find, in particular, that injections at 15°N or 15°S in spring of the corresponding hemisphere results in the largest reductions in incoming solar radiation."

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"Does researching geoengineering—specifically, stratospheric aerosol injection (SAI)—lead us onto a slippery slope, at the bottom of which awaits the deployment of a morally objectionable technology? Should we perhaps abandon research now on account of the possibility that we’ll slide down such a slope? In a recent publication, I argued that we should be cognizant of the possibility for research into SAI to lead to objectionable deployment scenarios."

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"Some scientists are finding fewer risks related to solar geoengineering than determined in earlier studies, adding emphasis to calls for a global body to monitor proposals that would inject substances into the upper atmosphere to reflect sunlight away from Earth."

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