According to Wikipedia:
Environmental psychology is an interdisciplinary field focused on the interplay between humans and their surroundings. The field defines the term environment broadly, encompassing natural environments, social settings, built environments, learning environments, and informational environments.
Since its conception, the field has been committed to the development of a discipline that is both value oriented and problem oriented, prioritizing research aimed at solving complex environmental problems in the pursuit of individual well-being within a larger society.
When solving problems involving human-environment interactions, whether global or local, one must have a model of human nature that predicts the environmental conditions under which humans will behave. This model can help design, manage, protect and/or restore environments that enhance reasonable behavior, predict the likely outcomes when these conditions are not met, and diagnose problem situations.
The field develops such a model of human nature while retaining a broad and inherently multidisciplinary focus. It explores such dissimilar issues as common property resource management,wayfinding in complex settings, the effect of environmental stress on human performance, the characteristics of restorative environments, human information processing, and the promotion of durable conservation behavior.
This multidisciplinary paradigm has not only characterized the dynamic for which environmental psychology is expected to develop, but it has been the catalyst in attracting other schools of knowledge in its pursuit as well aside from research psychologists. Geographers, economists, landscape architects, policy-makers, sociologists, anthropologists, educators, and product developers all have discovered and participated in this field.
Although “environmental psychology” is arguably the best-known and most comprehensive description of the field, it is also known as human factors science, cognitive ergonomics, environmental social sciences, architectural psychology, socio-architecture, ecological psychology, ecopsychology, behavioral geography, environment-behavior studies, person-environment studies, environmental sociology, social ecology, and environmental design research.