Synopsis The predominance of the realist paradigm of national security used to pontificate the Post Second World War view, dimension and design of international security declines with environmental catastrophe. Imperiously state centric and premised on enhanced state secrecy, nuclear and military power it was understood in terms of spatial strategies of distancing and boundary making as the key to the protection of geographically demarcated political community known as state. Delineated in realist idioms it has produced in the nuclear age the persistent possibility of nuclear winter not to mention environmental degradation on a global scale. The mounting environmental degradation coupled with its devastating consequences looms large occupying peremptorily the centre-stage of national security agenda making the realist analysis outworn and too inadequate to face these environmental posed non-military threats. Thus, the juxtaposition of security and environment comes at a time when the people feel it is no longer safe to remain impervious to these concerns with which the conventional outlook of national security has been grossly incongruent. The present book is an unconventional attempt at unearthing that underneath the simmering cauldron of violence and insurgencies in Indian states lie imperatively the environmental causes or factors inducing migration from Bangladesh which the policy makers are enjoined upon to reformulate what they have so far considered as national security prioritized on realist paradigm.