Reason just recalled that in 2021
"a team of Harvard scientists had an idea involving a large balloon and... a tiny quantity of sulfate particles, equivalent to the amount released in a single minute by a typical commercial aircraft.
These plans were greeted with utter panic. Activist groups declared the "risks of catastrophic consequences" were too great, and ... The Swedish government canceled the tests.
Fast forward to this year in Sicily where Etna is eructing a hundred tons of SO2 & sulfate particles a day.
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