This paper presents a new conceptual framework for environmental security as an integral and vital component of human security. The framework ties extreme environmental events and climatic anomalies to the destabilization of a country or region, which in turn can lead to instability, conflicts, weakening of the national economy, or exposure of vulnerabilities in critical infrastructure. The premise of this framework is that environmental security can be linked either directly or indirectly to homeland and national security concerns in both developing as well as developed countries and has direct links with the human security in any given region. Given the interdependencies of food, water, and energy security, population, economic impacts from natural disasters, the possible security implications from global climate change, and the potential for destabilization in regions where environmental living conditions are increasingly desperate, it is logical to incorporate principles of environmental security into both national and homeland security strategy planning. The authors present an organizing framework for thinking about such a planning process that allows these complex linkages to be considered at the policymaking level.