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Private companies have raised millions to block the sun. What could go wrong?

 What to know

A California startup, Make Sunsets, is using solar geoengineering to dim the sun by releasing sulfur dioxide balloons, sparking debate over private firms’ roles in climate intervention. Critics warn of potential risks, while proponents argue for faster innovation. Stardust, a competitor, is developing a more sophisticated method. The lack of regulation raises concerns about the impact of these technologies.

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