Solar geoengineering, or solar radiation modification (SRM) is a proposed type of climate engineering in which sunlight (solar radiation) would be reflected back to space to limit or reverse human-caused climate change. Most methods would increase the planetary albedo (reflectivity), for example with stratospheric aerosol injection. Although most techniques would have global effects, localized protective or restorative methods have also been proposed to protect natural heat reflectors including sea ice, snow, and glaciers.
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