Without sustained behaviour change from staff, even the most innovative and carefully planned green strategy will fail. “Green Champions” have long been a pillar of workplace sustainability initiatives and are key to achieving that behaviour change. The environmental manager recruits a few green and keen individuals who share their vision to save energy or reduce waste. They are responsible for instructing and motivating their colleagues, overseeing the practical aspects of project and liaising with management. Caroline Hand explores how the concept of a green champion has been evolving as lessons are learned from successful projects.