Dear friends,

Seth Baum is out of the office now, so I am sending the newsletter in his absence. This month, I would like to talk a bit about geoengineering. Geoengineering is the large-scale manipulation of the climate, particularly to alleviate the effects of climate change (also called “climate engineering”). Geoengineering epitomizes how many distinct global catastrophic risks have a dynamic relationship. For example, in one possible scenario, society decides to lower the planet’s temperature by engaging in stratospheric aerosol injection (SAI)—a technology that essentially blankets …