This book addresses the concept of statehood through an analysis on how sea-level rise and the Anthropocene challenge the territorial, demographical, and political dimensions of the State. Closely examining the fight for survival undertaken by low-lying Pacific Island States, the author engages with the legal and policy innovations necessary to address these new scenarios. This monograph reacts against overly formal approaches to the law on statehood, and is devoted to the reconstruction of the context in which both the challenges, and the measures adopted to tackle them, are taking place. Progressively forged within the international community, it is the kind of political and ethical framework that will soon inform the potential transformation of the law on statehood.