Geoengineering has been roughly defined as “the intentional manipulation of planetary systems at a global scale” (Keith 2000; Schelling 1996). This definition is neither as precise nor as informative as some would like. Nevertheless, we can fix ideas by focusing on the most prominent current proposal, which is to inject sulfate aerosols into the stratosphere to deflect incoming radiation and so cool the Earth's surface. This is a paradigm case: if anything counts as geoengineering, stratospheric sulfate injection (hereafter SSI) does.
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