This guide shows how to manage medical emergencies caused by environmental encounters. It stresses injury prevention and respect for natural environments. With how-to explanations and practical, direct advice, it covers emergencies such as envenomations, altitude illness, burns, motion sickness, and problems caused by cold, heat, snakes, sharks, and marine microbes. It includes information on bear attacks, cave rescue, airway and eye emergencies, and wilderness clothing. Diagnostic and treatment procedures with easy-to-follow, step-by-step instructions are included, as are definitions, clinical presentations, and treatments. The text emphasizes improvisation, so that the reader may efficiently use whatever materials exist in the environment to aid treatment.