This book is an introduction to the basic priciples of environmental economics as they have been developed in the past and as they continue to evolve. The real work, certainly to real world of environmental policy, is much more complicated than these principles would often seem to imply. The examples discussed represent only a sample of the full range of issues that actually exists. If and when you confront that real world of envireonmental economics and policy, you will find it necessary to adapt these principles to all the details and nuances of reality.