This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book explores business practice and performance on climate change in the light of the dramatic changes in the regulatory and policy environment. It examines the influence of economic instruments and government-sponsored voluntary programmes. The book aims to examine the outcomes that have been achieved and to draw lessons/conclusions about the design and implementation of such policy instruments. It presents a number of case studies where the climate group has catalysed significant change and reflects on the role that can be played by leadership initiatives in responding to the threat presented by climate change. The book argues that good practice norms are simply not sufficient and that conceptions of good practice need to be completely rethought if companies are to make a substantive contribution to the delivery of significant reductions in greenhouse gas emissions.