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
Proposals such as those of John Moore and colleagues (Nature 555, 303–305; 2018) for Antarctic glacier geoengineering understate the legal challenges presented by the Antarctic Treaty System (ATS). This system is crucial to Antarctic governance, but faces considerable geopolitical pressure (Nature 558, 161; 2018). It is essential that any activities affecting the Antarctic ecosystem properly engage with the ATS from the outset.