Solar Geoengineering Governance: A Fragmented Institutional Landscape Covering Multi-Dimensional Impacts

Abstract A widely made claim in academic scholarship is that the governance of solar geoengineering is characterised by gaps in international law and the absence of regulatory mechanisms. This article presents a more nuanced perspective on this claim. Instead of focusing on one comprehensive regime to govern solar geoengineering (whether its use or its non-use), we adopt a multi-dimensional impact approach to consideration of solar radiation modification (SRM) technologies and their governance. We outline the diverse array of adverse impacts that any SRM governance regime would need to contend with, and map how many of these impacts fall within the purview of existing international institutions and obligations. We conclude that any future SRM governance regime would need to build upon or at least not contravene these existing obligations. While our analysis thus modifies the claim of gaps in international law relating to SRM governance, it also suggests that the fragmented yet comprehensive coverage of diverse impacts does not mean that global coordination to govern deployment of SRM is already in place. Instead, the fragmented web of institutions and principles that exists provides room largely for restrictive SRM governance, in order to prevent adverse impacts within core areas of concern.