Trying to cool the Earth by dimming sunlight could be worse than global warming

A group of 60 scientists called for a moratorium on solar geoengineering last month, including technologies such as stratospheric aerosol injection (SAI). This involves a fleet of airplanes releasing aerosol particles—which reflect sunlight back to outer space—into the atmosphere, cooling down the Earth.

SAI could pose grave dangers, potentially worse than the warming it seeks to remedy.

A cooler ... 

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