Tellus Institute was established in 1976 as an interdisciplinary, not-for-profit research and policy organization. Its aim is to bring scientific rigor and systemic vision to critical environmental and social issues. Since 1976, the Tellus Institute has conducted 3,500 projects throughout the world, becoming an internationally recognized leader in the emerging field of sustainable development. Key thematic foci of Tellus’ work have included energy, water, sustainable communities, corporate responsibility, and climate change, with projects often featuring the development of alternative scenarios of the future. The Institute’s range of sponsors—private foundations, government agencies, the United Nations, and civil society and business organizations—has reflected the diversity of its program. Tellus has partnered with hundreds of organizations, notably the Stockholm Environmental Institute, with which it coordinated programs for nearly two decades.