Book excerpt: In A Theory of Environmental Leadership, Mark Manolopoulos draws on his original model of leading outlined in his cutting-edge book Following Reason to derive and develop the first properly systematic model of eco-leadership. Suppose humanity’s relation with the Earth may be described in terms of leadership "stages" or modalities: once upon a time, the Earth led or ruled humanity, and now we humans rule or lead the Earth. When the Earth led, the Earth flourished; now that humankind leads, the Earth flounders - ecological crises multiply and intensify. However, there might be a third stage or modality of leadership: humanity leading for the Earth, leading in a way that allows the world, including humans, to re-flourish. What would be the nature of this truly environmental form of leadership? A Theory of Environmental Leadership identifies and critically analyzes the two basic and incompatible positions associated with the way we construe and interact with the non-human: anthropocentrism (human supremacism) and ecocentrism (ecological egalitarianism). By rigorously analyzing and leveraging this polarity, this book outlines an innovative theory of eco-leadership together with some of its confronting-but-necessary measures. Expansive and incredibly timely, A Theory of Environmental Leadership is ideal for a range of audiences, from scholars and students of environmental leadership studies to activists and policymakers. The book’s remarkable clarity and engaging character also makes it suitable for the general public.