This book examines the spectrum of green behaviors in organizational settings, focusing on the contribution that employees make through their environmental engagement. The authors provide an overview of green behaviors while clarifying the meaning of the concept and its critical importance to greening employees. By distinguishing between voluntary (e.g., encouraging colleagues to express their ideas about environmental issues), prescribed (e.g., having an obligation to implement environmental policies), and counterproductive (e.g., not caring about water or electricity consumption) behaviors, the book rethinks sustainable development, placing the psychological and environmental dimensions on a par. Aimed at researchers in human resource management, organizational behavior, organizational change, and psychology, this interdisciplinary study proposes a novel approach to sustainability by assessing employee behaviors at work.