"This book is a synthesis of contributions drawn from the 12th Nitrogen Workshop held at the University of Exeter, UK. It provides a valuable compilation of current research, aimed at reconciling the environmental and economic components of N cycling within the context of a productive agricultural industry. The book is divided into seven main sections, which examine systematically, the nature of the problems associated with losses of N and a range of possible solutions. Section 1, ‘Drivers towards sustainability-why change?’ identifies the need to adopt new strategies to avoid losses to the environment. Section 2 considers the options for ‘Matching supply with demand’, followed by the reasons for, and means of ‘Controlling losses to air’ and to ‘water’ in section 3 and 4. Section 5 describes the challenges of ‘Reconciling productivity with environmental considerations’.