This book examines the two global trends of rising population and output on environmental change in the 21st century. These environmental changes can be thought of as "scarcities" of vital resources such as soil, water, and a stable climate and may cause widespread social disorder and violence. Contemporary examples of conflict are featured to highlight what those changes could possibly cause in the next century. The book explores why environmental issues have become so prominent in recent years and provides a framework for understanding them. The volume presents an overview of key environmental variables, including population growth, energy consumption, climate change, ozone depletion, deforestation, loss of agricultural land, decline in water supplies, depletion of fish stocks, and loss of biodiversity. Case studies are used to identify and illustrate links between environmental change and conflict with suggestions of how society can adapt and act for the improvement of both rich and poor countries. The table of contents lists the following: (1) "Introduction"; (2) "Where Will the World Be in 2025?" (3) "The Social Effects of Environmental Scarcity"; (4) "Violent Conflict and Environmental Scarcity"; and (5) "Long-term Security Implications." Discussion questions, an annotated reading list, and a glossary also are included. (EH)