Revised and fully updated, this textbook provides a detailed yet accessible introduction to the key aspects of ecosystem services. Ecosystem services is one of the most powerful guiding principles for ecology, biodiversity conservation and the management of natural resources. It provides the basis of assessing the multiple values and services that ecosystems can provide to humankind, including diverse issues such as carbon sequestration, flood control, crop pollination and aesthetic and cultural services. The second edition of Ecosystem Services: Key Issues has been fully revised and updated to address policy and scientific developments, as well as new and emerging issues, such as nature-based solutions, zoonotic diseases and environmental justice. It includes new and updated case studies from across the world and each chapter contains further reading, learning objectives and discussion questions to aid student learning. The book details the historical roots of ecosystem services in the second half of the twentieth century, through initiatives such as the Millennium Ecosystem Assessment, The Common International Classification of Ecosystem Services (CICES) and the United Nations Sustainable Development Goals. It shows how ecosystem goods and services can be categorised and valued in economic as well as non-monetary terms, while also highlighting some of the difficulties and limitations of valuation techniques. The author describes how themes such as systems thinking, social-ecological resilience and natural capital relate to ecosystem services, and how these can contribute to more sustainable and equitable development. This book will be essential reading for students and scholars of ecosystem services, ecology, environmental science, biodiversity conservation, environmental economics, natural resource management and sustainable development. It will also be of use to professionals and policymakers who are looking to integrate ecosystems and their services into their decision making processes.