This handbook illustrates concepts, methods and tools for "primary environmental care", an approach that seeks to empower communities to meet basic needs while protecting the environment. In particular, it focuses on how population size, structure, growth (or decline) and movements relate to the quality of the environment and the quality of life. Emphasis is placed on a community-led process of participatory action research in which local knowledge and skills are fully utilized. A main purpose is to promote the effective, integrated management of environment and population dynamics for the benefit of local people. As a collection of tools for action, it is designed for professionals in conservation and natural resource management, development, population and public health who wish to promote and assist participatory action research in rural communities.