In recent years, there has been an increasing interest in sustainable development that could be regarded both as new constraint and opportunity to achieve a competitive advantage. Several tools like the implementation of an Environmental Management system, the adoption of Life Cycle assessment and Eco-Labelling may be used in order to enhance companies' competitiveness. In this context, policy makers are challenged to design effective policies and organizations for exploiting the opportunities that increasing environmental awareness provides. In order to make this task easier a holistic and systemic approach based on modeling may be used, so that users understand both structure and dynamics of complex systems in which they are in.