With limited success, international relations scholars have used principal-agent theory (P-A) to understand gaps in global governance. While P-A may not provide robust explanations, it is still useful for mapping long chains of complex, boundary-crossing relationships and locating the gaps that characterize global environmental governance (GEG). In this article, first I argue that we can get beyond merely locating and describing governance gaps, and start explaining them, by considering the problems of accountability that contribute to those gaps. Second, I argue that outsourced sustainable development projects, implemented by for-profit contractors, provide an under-studied and under-