Known as SCoPEx, short for stratospheric controlled perturbation experiment, the project focused on a form of geoengineering often referred to by scientists as solar radiation modification.
Most reflective aerosols don't last very long in the atmosphere, meaning they'd need to be sprayed constantly in order to maintain a cooler planet. If the spraying suddenly stopped, global temperatures could skyrocket so rapidly that they could threaten life on Earth.
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