Each of the six articles in this Special Issue on "Greening Organizational Behavior" offers a perspective that provides unique insight and enriches our understanding of organizational greening. As a set, the articles span all levels of analysis, from a study of individual differences to an investigation of leadership dynamics to the analysis of firms and their institutional environments. Taken together, these articles illustrate the complex nature of organizational greening and highlight the need for research that adopts a systems perspective. The embedded and nested nature of organizational greening behavior requires additional research that investigates the interrelated influences of greening behavior by individual employees, work groups, and organizations. By recognizing and appreciating these multi-level dynamics, scholars of organizational behavior are poised to improve our understanding of effective organizational greening initiatives and thereby promote advancement toward environmental sustainability.