This chapter examines the way climate change and natural disasters can impel people to migrate across national borders. The difficulties in measuring environmental impacts and in unambiguously connecting them to resultant migration are discussed. Relevant research studies are summarized, focusing upon different patterns that are observed between the Global South and the Global North. An important conclusion gleaned from this research is that the link between environmental stressors and migration often involves economic deprivation or civic unrest as proximate drivers. The chapter concludes with a review of the various ways that towns and cities affected by severe environmental impacts have managed to adapt to the changed conditions.