Good environmental information is essential for effective sustainable development policy-making and action planning. Accurate information increases the chances for correct decisions. This does not guarantee a healthier environment, but its absence seriously impedes decisions which would lead to a sustainable future. Ideally, local, sectoral, corporate, national, regional, and global reports should complement one other, using, for example, common spatial units and databases. In reality comprehensive and integrated information is often not available for today's decision makers. The Source Book is designed to help to harmonize environmental reporting by encouraging the development of standard methods, practices, and terminology. It evaluates and compares alternative approaches for the development, production, and dissemination of environmental information, and combines the collective experience of environmental reporting, covering all aspects of reporting from user needs to data supply.

This volume provides a comprehensive and detailed analysis of the conditions of the global environment, highlighting key global concerns and making recommendations for policy action.

How do we take stock of the state and direction of the world’s environment, and what can we learn from the experience? Among the myriad detailed narratives about the condition of the planet, the Global Environment Outlook (GEO) reports—issued by the United Nations Environment Programme—stand out as the most ambitious. For nearly three decades the GEO project has not only delivered iconic global assessment reports, but through its multitude of contributors has inspired hundreds of similar processes worldwide from the regional to the local level. This book provides an inside account of the evolution of the GEO project from its earliest days. Building on meticulous research, including interviews with former heads of the United Nations Environment Programme, diplomats, leading contributing scientists, and senior leaders of collaborating organizations, the story is told from the perspective of five GEO veterans who all played a pivotal role in shaping the periodic assessments. The GEO’s history provides striking insights and will save valuable time to those who commission, design and conduct, as well as critique and improve, assessments of environmental development in the next decade.