As average global temperatures will likely surpass the goal set by the Paris Agreement within the next ten years, solar geoengineering, in particular Stratospheric Aerosol Injection (SAI), is gaining attention as a potential climate response. Nonetheless, many warn that reliance on SAI could reduce vital efforts to curb greenhouse gas emissions. Existing governance proposals consistently acknowledge this challenge but do not address it while the few academic papers on the topic rely on a single, benevolent decisionmaker. I respond to this challenge as well as demands for equitable representation (given SAI would have worldwide impacts) by drawing on classic social choice theory to develop an SAI decision-making mechanism that is inclusive, democratic, and encourages countries to meet their mitigation goals. Further, I demonstrate how strategic coalition building can incentivize mitigation beyond stated goals. Finally, I contemplate potential challenges to my proposed mechanism including threats of nonparticipation. The result is a practical governance mechanism that incorporates multiple strategic actors with heterogeneous interests and that balances climate intervention with necessary mitigation.
