MIT Technology Review: This alarmingly simple hack could let anyone tinker with the climate

"Adapting balloons into geoengineering devices may simply require mixing helium with a few kilograms of sulfur dioxide, a compound that in the stratosphere is converted into sulfuric acid, which in turn casts away heat. Pressure will build inside each balloon as it ascends, until it bursts somewhere above 20 kilometers (12 miles), scattering its contents into the atmosphere."


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