Climate Engineering: A Normative Perspective takes as its subject a prospective policy response to the urgent problem of climate change, one previously considered taboo. Climate engineering, the "deliberate, large-scale manipulation of the planetary environment in order to counteract anthropogenic climate change," encapsulates a wide array of technological proposals. Daniel Edward Callies here focuses on one proposal currently being researched--stratospheric aerosol injection--which would spray aerosol particles into the upper atmosphere to thus reflect a small portion of incoming sunlight and slightly cool the globe.