Kiel,

Global Citizen: To Slow Climate Change, Why Don't We Just Block the Sun?

"Imagine a capsule is launched 70,000 feet into the sky above Arizona and begins to release 100 grams of sulfur, calcium carbonate, or some other substance into the atmosphere. The device then floats back and forth through the ensuing cloud for the next several hours before it disperses, measuring chemical reactions and seeing how much sunlight is being blocked."

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