Using the lens of postcolonial feminism and with particular focus on immigration accross the U.S.across/Mexico border, this book explores the processes by which security threats are identified and interpreted, and thus the relationship between national, civilizational, and environmental security within mainstream environment security discourse in the United States. Another distinctive element of the book is that its focus on the broader discourse of environmental security and immigration, examining the articulation of environmental security concerns over immigration across U.S. institutions such as the media, the state, NGOs, and academia to unpack the ways these threats are identified and interpreted.