This book aims to assess the contributions and limitations of the Aberystwyth School and the Copenhagen School of Critical Security Studies for the analysis of environmental security. The Aberystwyth School broadens the research agenda by allowing room for the analysis of different environmental problems experienced by various referents. The school offers bringing about progress and change in the meaning and making of security through politicization and emancipation. However, the cases fall short demonstrating how to reach emancipation at the global level. The Copenhagen School, on the other hand, demonstrates how securitization process works and reveals how this process attracts attention, measure, policies and resources to environmental concerns. Given the school's fixed understanding of construction of security through urgency, speech acts and state elites, the analytical strength of the Copenhagen School for the environmental security analysis is limited.