Summary/Abstract
Governments disagree even on the current state of climate change engineering governance, as became clear at the 2019 United Nations Environment Assembly negotiations. This paper identifies how they must develop mechanisms to provide policy-relevant knowledge, clarify uncertainties and head off potential distributional impacts. It concludes with a call for transparency to help resolve questions of governance and “ensure that the world has the tools to manage these potent technologies and practices if and when decisions are ever taken to use them.”