GoKawiilPlanetary Sunshade Institute details 20-to-40-year plan for space-based solar shield
A Los Angeles non-profit, the Planetary Sunshade Institute, has published a report compiling research from engineers and climate scientists, including contributors linked to NASA, on building a giant sunshade between Earth and the Sun to cool the planet. The report estimates construction could become feasible within 20 to 40 years, contingent on development of heavy-lift rockets capable of carrying millions of tonnes of material into deep space. The study follows a social-media post by Elon Musk suggesting satellites could 'solve global warming' for a billion years, though SpaceX did not confirm any involvement in such research.
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The report signals that an idea once dismissed as science fiction is gaining structured academic attention, partly because falling launch costs make large-scale space construction more plausible, according to engineer Chantal Cappelletti. Still, the timeline depends entirely on unproven heavy-lift rocket technology, meaning the proposal remains speculative rather than an imminent solution. Solar geoengineering of any kind continues to raise unresolved questions about governance, risk and unintended climate consequences.
- The Planetary Sunshade Institute's report is described as the most detailed analysis yet of a space-based sunshade concept.
- Researchers estimate construction could be viable in 20–40 years, depending on heavy-lift rocket development.
- The idea follows Elon Musk's suggestion of satellites cooling Earth, though SpaceX has not confirmed related research.
Source: nature.com — Dinneen, 2026-10-28
Published there as: “Could a giant sunshade in space ‘solve global warming’? Scientists are taking the idea seriously”
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