This chapter introduces the potential of satellite Earth Observation (EO) as a tool for improving the implementation of Multilateral Environmental Agreements (MEAs). It provides the technical and legal characteristics of EO and discusses the unique advantages of EO in collecting the environmental information which is a key for effective implementation of MEAs. It also studies the challenges and future steps for application of EO into MEAs process. Emerging trends and recent initiatives are introduced for reader’s future consideration. By showing the issues surrounding such an application, author hopes to contribute to the further promotion of EO application to the effective implementation of MEAs.