In this paper we examine the role of climate change, migration, and security broadly at the national level in India and Bangladesh—and then zero in more closely on northeast India and Bangladesh to demonstrate the interlocking problems faced by the people there and writ larger across all of South Asia.Climate change, migration ad security are considered as three distinct layers of tension assess scenarios in which the three layers will overlap. The Indian border state of Assam is a case study on where the three factors converge.