Environmental psychology can mean one of two related things:
1) An interdisciplinary field focused on the interplay between humans and their surroundings.
Various researchers have also termed this 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.
This definition is an important field of study for good design of the built environment and urban planning.
2) The relationship between people's psychology, and their behavior in terms of sustainability.[verification needed]
This is an unusual use of the term - choosing another term would be desirable for clarity.
This subject is discussed at the Appropedia page on Psychology.
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