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Startups want to geoengineer a cooler planet. With few rules, experts see big risks

SAN JOSE, Calif. — One morning late last year, an RV pulled into a parking lot on the outskirts of Silicon Valley. Inside it was a blue Ikea bag with huge balloons, and metal tanks full of helium and sulfur dioxide gas. The mission was led by Luke Iseman, a 41-year-old serial entrepreneur with a …

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