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Geoengineers set date for Sun-dimming balloon test

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www.sciencemag.org

Paul VoosenFor years, the controversial idea of solar geoengineering—lofting long-lived reflective particles into the upper atmosphere to block sunlight and diminish global warming—has been theoretical.

It’s starting to get real: Today, after much technical and regulatory wrangling, Harvard University scientists are proposing a June 2021 test flight of a research balloon designed to drop small amounts of chalky dust and observe its effects.

This first flight would not inject the particles; it would only be a dry run of the steerable balloon and instruments needed to study chemical reactions in the stratosphere, the calm, cold layer more than 10 kilometers up.

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