- An Israeli‑US startup, Stardust Solutions, proposes spraying tiny particles made from common materials — an anti‑caking food additive (amorphous silica) and calcium carbonate (eggshell mineral) — into the stratosphere to reflect sunlight and cool the planet.
- Many scientists and ethicists are worried: solar geoengineering could change rainfall and weather patterns, pose health risks, and raises governance concerns—especially since a for‑profit company is developing the tech.
- Stardust says each million tons would cost about $10 billion and cool ~0.9°F for a year but would need annual replenishment, creating fears of a dangerous "termination shock" if efforts were suddenly stopped.
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