The book investigates the scientific, technical, and socio-economic aspects of climate change as understood at the turn of the millennium. Authored by Bert Metz, a key figure in climate science assessment, this work synthesizes the findings of the Intergovernmental Panel on Climate Change (IPCC) Third Assessment Report. It presents the state of knowledge regarding climate change impacts, adaptation, and mitigation strategies, drawing on a vast body of scientific literature and expert consensus. The book aims to provide a comprehensive overview for policymakers and researchers.

This book, as a key component of the IPCC Third Assessment Report, represents a significant scientific consensus document from its time. It is regarded as a foundational text for understanding climate change science and policy discussions in the early 2000s. The report's findings informed international negotiations and national policy development, establishing a baseline for subsequent climate assessments. Its authority stems from the rigorous peer-review process and the collective expertise of hundreds of scientists worldwide.