Recently, research into the possibilities of developing solar radiation management and other geoengineering technologies has gained new momentum. Just last year, Cambridge University announced the opening of a “Centre for Climate Repair” as part of the university’s Carbon Neutral Futures Initiative. Recent modeling work gives hope that SRM could confer more benefits than previously thought. But opposition to even conducting research into SRM remains strong. I use the case study of SRM to develop a framework, based on a theorem by (...) I.J. Good, for thinking about the benefits and costs of acquiring new evidence and for thinking about the conditions under which new evidence could be harmful. I argue that the expected benefits of supporting public research in SRM technologies outweigh the expected costs and harms. (shrink)