Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
Stephen Andersen calls for governance of climate engineering, suggesting that the Montreal Protocol could take on full responsibility for the task (Nature551, 415; 2017). However, the protocol’s assessment experts focus solely on stratospheric processes, and in our view would be unlikely to be able to take on regulation of the full range of ambitious geoengineering projects.