Professor Paul G. Harris is among a distinguished group of senior scholars from around the world who are the First Signatories of an Open Letter calling for an International Non-Use Agreement on Solar Geoengineering. The Open Letter calls for immediate political action from governments, the United Nations and other actors to prevent the normalization of solar geoengineering as a climate policy option. Specifically, the signatories call for an International Non-Use Agreement on Solar Geoengineering. For more information, see the following website: https://www.solargeoeng.org/