This paper examines the links between climate change and security in the island states of the South-west Pacific. A worst-case scenario of climate change is presented which suggests that land will be lost or rendered uninhabitable in all Pacific Island states as a result of climate-change impacts. Loss of land is the focus of this paper for two reasons. Firstly, land is interwoven in the lives of many Pacific Islanders; it provides economic, cultural and spiritual security at a number of geographical scales. Secondly, a focus on land demonstrates clearly how an environmental threat such as climate change can undermine economic, societal, political and military security ill the island states of the Southwest Pacific. Clearly, climate change is an important threat to human security, and should be dealt with accordingly.