Dr. Daniele Visioni and Dakota Gruener provide an introduction to the state of scientific research on sunlight reflection, with a focus on stratospheric aerosol injection (SAI). Dr. Daniele Visioni is an Assistant Professor at Cornell University, co-chair of the Geoengineering Model Intercomparison Project (GeoMIP) and the WCRP Lighthouse Initiative on climate interventions, among other academic pursuits. Dakota Gruener is the CEO of Reflective, a research nonprofit.