Solar Flair A Geoengineer's Sunscreen
WIRED|February 2019
Solar Flair A Geoengineer's Sunscreen

TO HELP CURE the planet’s ailments, Zhen Dai suggests antacid. In powdered form, calcium carbonate—often used to relieve upset stomachs—can reflect light; by peppering the sky with the shiny white particles, the Harvard researcher thinks it might be possible to block just enough sunlight to achieve some temperature control here on Earth.

Rebecca Heilweil

Dai’s work calls for a custom-designed test balloon that, pending an independent committee’s green-light, is set to release up to a kilogram of calcium carbonate 12 miles above the US. Small onboard propellers will stir the payload into the air—in what will be the first solar geoengineering experiment in the lower atmosphere.

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February 2019