Should we block some sunlight to cool the planet?

In this episode, Dakota Gruener of Reflective walks me through her organization’s new project, which maps the gaps in our scientific understanding of stratospheric aerosol injection — currently the leading candidate for directly cooling the planet. We get into what we don’t know (including a factor-of-two disagreement on basic aerosol physics), who’s already doing this without oversight, and the unsettling governance question of who controls the Earth’s thermostat once humanity has grabbed it.(P...