Climate change is one of the greatest challenges of the 21st century and has significant implications for international security. Climate security is an evolving area in international relations and is increasingly included in strategy papers and reports of international organisations. However, it does not yet have a legally binding framework. This Master's thesis explores the institutionalisation of norms in international organisations through the example of climate security. Based on a constructivist approach to norm development in international organisations and an upgraded model of norm life cycle, it analyses the impact of climate security norm development on the formulation of climate security strategies and policies in international organisations. The upgraded model of norm life cycle is empirically analysed, using a process tracing method as a basis, through the case of the European Union as the earliest proponent of the climate security norm in international organisations and as one of the key actors in European and international climate science policy-making. The analysis of the development of the climate security norm in international organisations highlights the dynamic process of norm development, which depends on interactions and interests of international actors at all stages of the norm life cycle. International organisations provide a platform for climate security policy-making, but implementation requires enhanced co-operation between international organisations, strong political will and a unified understanding of climate security.
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