Part of the New Horizons in Environmental Economics series, this text focuses on estimating economic values for nature. The volume presents a collection of papers prepared over 25 years, dealing with the theory and practice of non-market valuation for environmental resources. Taken together, the papers explore the conceptual basis, the implementation process and empirical performance of all available methods. These essays describe what has been learnt from past benefit analysis, using meta-analysis, as well as the issues at the frontiers of current research in the area.