Conservation is at the core of environmental science. Maintenance of the diversity of species and habitats, and the sustainable use of resources, are important to protect the options of future generations. Many would argue it is also a moral imperative that humanity does not needlessly destroy other inhabitants of this planet.

No single book can cover in depth the full range of the science and practice of conservation. I hope that this small guide can at least give an overview of the scope of the subject. It is intended to serve both as an introduction to those new to the field, and as a modern synthesis to demonstrate links between the many specialisms required in conservation. It focuses on generalities, which are illustrated by examples and supported by evidence from the field and from theory. It is intended as an aid for coursework, fieldwork, and management. Technical terms have been kept to a minimum. Instead of a glossary, a definition is given at the first use of specialist terms and phrases (which can be found via the index). There is slight overlap between some sections, to make each more self-explanatory. A huge amount is being written about conservation, and this book should help to guide readers towards the most influential specialist sources.

Environmental sciences are advancing rapidly, against a cultural and policy background that is changing even faster.