Stardust Solutions in Podcasts
companyU.S. based company working on biodegradable particles for solar geoengineering, made of calcium carbonate and silica
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From "How We Survive": How to Dim the Sun
Stardust recently revealed what it calls biodegradable particles that could be used to reflect sunlight, made out of calcium carbonate, a compound found in limestone, and amorphous silica, an anti-caking agent used as a food additive, though so far the particles have only been tested indoors.