Ecosystem science has developed into a major part of contemporary ecology, and it is now applied to diagnose and solve a wide range of important environmental problems. "Fundamentals of Ecosystem Science" provides a compact and comprehensive introduction to modern ecosystem science. Written by a group of experts, this book covers major concepts of ecosystem science, biogeochemistry, and energetics. It addresses, contrasts, and compares both terrestrial and aquatic ecosystems. It combines general lessons, concepts, frameworks, and challenges in highly accessible synthesis chapters. It presents firsthand case studies, written by leaders in the field, offering personal insights into how adopting an ecosystem approach led to innovations, new understanding, management changes, and policy solutions.