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past teachers, I particularly thank Professor Zehou Zheng for his contribution during my time as an undergraduate and graduate student at the Hubei University, Wuhan, China. As for the colleagues from whom I have learnt so much, the contributions from Professors Sihua Liu and Hanchuan Lin are worthy of special acknowledgment. I owe my greatest intellectual debt to Robert Costanza and Herman Daly. The impact of their insights on ecological economics on my thinking and this book is significant. I also thank Seth Cook, John Coulter, Mark Diesendorf, John N. R. Jeffers, Richard Norgaard, John Proops, Richard Sanders, Clem Tisdell, and Songpei Wang for making helpful comments and suggestions on this research. I am very grateful to Warren Halloway and Barbara Diehl for proofreading an earlier draft of this book.
However, my greatest debt is owed to my family and friends, particularly my wife, Yüqing Tian; my father, Zuying Shi; and my mother, Yüjuan Zhao. I am also grateful for the spiritual encouragement from Chunxia Wang and Xiufang Wang. Without their love and support, this book would never have been possible.