Can Some Very Tiny Particles Cool the Planet? One Tech Company Says Yes.

Stardust Solutions, a company led by former members of Israel’s nuclear energy program, has released research detailing its proposal to use tiny atmospheric particles to reflect sunlight and combat global warming. The firm, founded in 2023, has secured $75 million in funding, filed a patent, and plans to publish its findings in peer-reviewed journals, though CEO Yanai Yedvab emphasizes no outdoor testing will occur without government collaboration. The particles, composed of amorphous silica and calcium carbonate, are designed to be biodegradable and non-toxic, dispersing in the upper atmosphere to reduce solar radiation. Yedvab argues the technology could be a critical tool as greenhouse gas emissions rise, urging policymakers to prepare for potential deployment. However, critics—including over 600 scientists—warn of unintended consequences, such as disrupted monsoon patterns harming agriculture in South Asia, East Africa, and Latin America. Tennessee and Florida have already banned geoengineering, and a federal bill introduced by Rep. Greg Steube (R-FL) seeks a national prohibition. The Biden administration previously studied solar geoengineering in 2023, but no action has been taken under the Trump administration. Stardust spent $370,000 last year lobbying U.S. officials, though the company declined to name specific discussions. Opponents like Prakash Kashwan, a Brandeis University environmental studies professor, highlight the lack of scientific certainty about long-term effects, particularly for vulnerable populations dependent on seasonal rainfall. The debate underscores the tension between climate intervention as a last-resort solution and the risks of altering Earth’s natural systems without full understanding.