now pay a water bill in order for the town to buy and restore land adjacent to the municipal water source; and international examples of evaluating and paying for services is no less a fascinating field of ongoing development. See also Payment for Ecosystem Services Ecological economics Ecological goods and services Environmental Ethics Deep Ecology Earth Economics References General Pearce, David W. and R. Kerry Turner, 1990. Economics of natural resources and the environment. BPCC Wheatsons Ltd., Exeter, UK. 378 pp. Futehally, Ilmas. Strategic Foresight Group, India. External links Assessment Report on Diverse Values and Valuation of Nature by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), 2022. Environmental Valuation Reference Inventory Ecosystem Valuation Toolkit The EcoValue Project Nature Valuation & Financing Network Ecosystem Valuation Reports on environmental valuation in Tropical countries GecoServ- Gulf of Mexico Ecosystem Services Valuation Database Ecological economics Systems ecology