This chapter examines how migrants tend to move to cities; how helping refugees is a question of human rights; how terrorism, national security, and ethnic conflict affect migration policy and societal relations; how migrants influence the economy; and the nexus between migration and the environment. It explores the intersection between migration and the environment. The chapter analyzes the continued challenge of coping with irregular low-skilled migration. It describes the individual motivations, consumptive patterns, and realities of lifestyle migration, but there are also larger macro-forces to our understanding of the process. The chapter deals with the history and geography of global migration, its social implications, the relationship between migration and the global economy, and the current and past public policy environments as they relate to the regulation and control of the movement of people. It explains that in the future there will be increasing movements of people as a result of environmental disasters, rising sea levels, and overall climate change.