Can people remain healthy in a world that is sick? Many ecological disasters can be directly traced to careless exploitation of the environment, with human beings as first perpetrator and then victim. Our health closely mirrors the health of our surroundings: this is the basis of the Ecohealth approach. It recognizes the inextricable links between humans and their biophysical, social, and economic environments, and that these links are reflected in the population's state of health. Reconciling an ecosystem's health with the health of its human inhabitants is a new area of research, requiring input from scientists, community and interest groups, and decision-makers. This book describes this new approach, providing lessons and recommendations from various IDRC-supported research activities. It demonstrates how decision-makers, in particular, can use the Ecohealth approach to formulate policies and solutions that are both immediately visible and sustainable over the long term.