Global concern over the disappearance of many ecosystems and habitats
has prompted policy makers to consider the implications of this loss for
human welfare and environmental decision-making. The result has been
a number of inter-disciplinary assessments by economists, ecologists and
other scientists highlighting the need to ‘value’ the goods and services provided
by key global ecosystems (Daily, 1997; Heal et al., 2005; Millennium
Ecosystem Assessment, 2005; Pagiola et al., 2004; World Resources
Institute, 2001). This interest in ‘valuing’ ecosystem services raises two
important questions. What are ecosystem services, and what are the particular
measurement issues that must be addressed when valuing these
environmental fl ows?
Global concern over the disappearance of many ecosystems and habitatshas prompted policy makers to consider the implications of this loss forhuman welfare and environmental decision-making. The result has beena number of inter-disciplinary assessments by economists, ecologists andother scientists highlighting the need to ‘value’ the goods and services providedby key global ecosystems (Daily, 1997; Heal et al., 2005; MillenniumEcosystem Assessment, 2005; Pagiola et al., 2004; World ResourcesInstitute, 2001). This interest in ‘valuing’ ecosystem services raises twoimportant questions. What are ecosystem services, and what are the particularmeasurement issues that must be addressed when valuing theseenvironmental fl ows?
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