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Israeli Geoengineering Startup Releases Detailed Blueprint for Annual Release of 10 Million Tons of Engineered Silica Particles into the Stratosphere In a development that is drawing sharp scrutiny from scientists and governance experts, Stardust Solutions—a U.S.-incorporated, Israel-based startup founded in 2023—has published a comprehensive feasibility study outlining the full industrial chemical process for manufacturing and deploying massive quantities of custom-engineered silica aerosols aimed at reflecting sunlight to cool the planet. The study, released May 14, 2026, lays out a clear pathway to “climate-scale” production: scaling up to 10 million metric tons per year of Submicronic Engineered Amorphous Silica Particles (SEASP) for stratospheric aerosol injection (SAI). That volume would be sufficient, the company states, to achieve roughly a 1% reduction in incoming solar flux. The document reads less like speculative research and more like an operational engineering manual. It details reactor designs, supply chain integration with existing chlor-alkali infrastructure, hazardous chemical handling (including tetraethyl orthosilicate, silicon tetrachloride, chlorine gas, ammonia, ethanol, and hydrophobic surface treatments like trimethylmethoxysilane), particle sizing in the 250–500 nanometer range, and cost targets of approximately $5–5.70 per kilogram at full scale. Rollout timelines are ambitious: roughly five years to reach 250,000 tons annually, seven years to hit one million tons, and eventual expansion to the full 10-million-ton target. The particles are deliberately engineered for prolonged stratospheric residence—on the order of a year—through precise morphology, narrow size distribution, and hydrophobic coatings to maximize sunlight scattering while minimizing fallout. Stardust emphasizes that decisions on actual deployment rest with governments and the international community. Yet the publication of such granular manufacturing flowsheets, aircraft considerations, monitoring systems (including potential traceable markers), and infrastructure requirements marks a significant step toward normalizing this technology as a practical industrial endeavor. This comes amid growing calls for restraint. More than 590 climate scientists and scholars have endorsed an international non-use agreement on solar geoengineering, citing profound risks around governance, termination shock, regional climate disruptions, and the ethical implications of large-scale atmospheric intervention. Particularly concerning to critics is the study’s heavy emphasis on technical feasibility, scaling logistics, and deployment engineering, with comparatively limited detailed discussion of long-term human inhalation toxicology, chronic ecosystem exposure, or multigenerational environmental impacts from persistent nanoparticles that would ultimately deposit across the planet. Whether viewed as a necessary emergency tool or an alarming privatization of planetary systems, the release of this chemical and operational playbook shifts the conversation. What was once largely theoretical modeling is now presented with concrete supply chains, cost curves, and production timelines. The full study is publicly available. The transparency invites scrutiny as much as it signals ambition—and raises urgent questions about consent, oversight, and the wisdom of treating the shared global atmosphere as an adjustable industrial process.