In recent years, environmental psychology has evolved rapidly, integrating concepts and approaches from a range of different disciplines. Person-environment interaction involves so many factors that it requires solid theoretical foundations to understand the variables associated with this interaction. The present special issue offers a reflection of this reality, since it compiles research that aims to innovate from a theoretical point of view but which also introduces new methodological concepts and approaches. The influence of different psychosocial variables on behaviours and environmental commitment is evaluated at a substantive level. Traditionally tackled demographic variables are studied, but a more integral approach is also proposed, which incorporates complex concepts that influence the lives of people, such as culture, quality of life, satisfaction, life expectations, and the emotions present when making decisions about how to behave pro-environmentally.