The remainder of the book provides an accessible introduction to the major elements of human ecological theory including language, culture, and technology; structure, function, and change; edges and boundaries; interaction, integration, and institution; diversity; and adaptation. The chapters are organized hierarchically from the smallest scale to the largest with each chapter addressing a specific level as an ecosystem. The final chapter probes some of the ethical implications of this new field. Human Ecology brings together for the first time scholarship from the social and natural sciences as well as the environmental design arts to offer an overview of the field of human ecology and to show how the field may help us to envision our futures. While the approach is largely theoretical, it has broad policy and practical implications, and represents an important new work for anyone concerned with interactions between humans and the environment.