For relatively modest amounts of sulfur dioxide injected into the atmosphere, you could easily cool Earth by 1% or more, if you want.
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About Nathan Myhrvold
Nathan Myhrvold was chief technology officer at microsoft. Nathan Paul Myhrvold is an American inventor, scientist, and businessman, former Chief Technology Officer at Microsoft, co-founder of Intellectual Ventures and TerraPower, and the principal author of Modernist Cuisine and its successor books. Read more on Wikipedia →