Legitimacy and procedural justice: how might stratospheric aerosol injection function in the public interest?

The success of stratospheric aerosol injection (SAI) in limiting global heating requires the inclusion and maintenance of the political ideals of legitimacy and procedural justice. Without them, the prospects are slim that this institution can be developed and operated in the public interest in such a way that it will protect and promote social well-being by minimising climate-related harm. Long-term legitimacy and procedural justice are crucial to several sensitive features of SAI. They relate to openness, inclusivity, and independence in dealing both with external issues of concern to stakeholders representing the general public and with internal issues concerning agents directly involved in SAI. This article begins by outlining notions of legitimacy and procedural justice and the criteria appropriate for SAI. Then it investigates how the indications provided by the related standards and the consequent morally sound governance options advanced might warrant that SAI is not distorted in such ways that it serves the vested interests of private parties. Finally, the article outlines two recommendations for ensuring that legitimacy and procedural justice in SAI are achieved and maintained over time, so that it can work continuously in the public interest.