Post-Cold War threats to security arise from human degradation of ecosystems as much as terrorist attacks and wars. Page (environmental sensibility, Keele U., UK) and Redclift (international environmental policy, King's College, London) introduce the concepts, history, challenges, and international case studies of sustainable development focusing on how environmental stress is linked to insecurity and violent conflict. Besides developing renewable resources to end dependence on hydrocarbon fuels, challenges addressed in these dozen scholarly papers include redefining "security" and "sustainability," valuing nature economically, distinguishing between environmental and ecological security, and conducting robust research on relevant indicators. Includes perspectives from the US, European Union, and developing regions such as Sub-Saharan Africa.