Sustainable development is a new mantra for a coherent multilateral approach in addressing globalization. It entails a widespread and comprehensive approach in dealing with interlinked issues as environmental protection, economic development, democratization, the pursuit of human justice, and peace. Sustainable development States and individual policy makers cannot clearly anticipate or address environmental threats without better mechanisms for environmental policy advice. Promoting sustainable development entails global governance that reflects guidance from an interdisciplinary knowledge base that is capable of generating accurate assessments of the world, and relies for its legitimacy on a deliberative process that engages states and multiple non-state actors, including civil society, expert networks, the private sector, and possibly local communities. The process of developing and circulating usable knowledge provides a provisional and rudimentary roadmap for a new model of reflexive governance, based on processes of social consensus. Epistemic communities are the actors involved in formulating and disseminating usable knowledge.