The purpose of the grant is to write a scientific publication that extends currently existing literature on theory of international environmental agreements (IEAs). This is to be done through utilizing empirically supported dynamic game-theoretic model, where both IEA membership and environmental policies of countries depend on the pollution stock. These results provide an essential mathematical modeling backbone which may support future empirical analysis of international policy coordination of Baltic Sea protection. Such empirical study of policy analysis ahs already received funding through BONUS EEIG within GO4BALTIC consortium (Coherent policies and governance of the Baltic Sea Ecosystems), and implementation of that task is scheduled for 2016. Even though the present research proposal and the aforementioned future empirical application are independent tasks, scientific results of the former can set most promising directions and strengthen empirical analysis of the Baltic Sea policy coordination.