Part I - Introduction.- The Emergence of Green Business Models.- Purpose of this Work and Research Approach.- Part II - Theoretical Foundation of Green Business Model Transformations.- Environmental Sustainability in Business.- The Business Model Concept as a Unit of Analysis for Management Science.- Towards a Taxonomy of Green Business Models.- Organisations, Change, and Innovation.- Part III - Towards a Practical Management Approach.- A Survey on Green Business Model Transformations.- Managerial Implications of Survey Results.- Managing Green Business Model Transformations - A Framework for Management Practice.- Part IV - Conclusion and Outlook.- Conclusion and Outlook.