In the five years since the Paris Agreement, achieving net zero emissions has become a defining frame for climate action. We review over 4000 countries, companies, and subnational governments, which together make up the preponderance of global emissions. We find 769 of these entities have net zero targets, but only 152 meet minimum criteria for robustness, including timing, status, coverage, use of offsets, and governance. Though net zero is now widespread as a concept, its operationalization is still in its infancy. Making net zero targets robust should now be a priority for policymakers in order to deliver Paris-consistent action, as well as securing more ambitious targets.
