The Millennium Ecosystem Assessment (MA, http ://www.MAweb.org) was the first global assessment of ecosystem services. The purpose of an assessment is to synthesize peer-reviewed scientific information in a form that is relevant to policy, but does not prescribe policy. The overarching goals of the MA were to synthesize information about the status, trends, and plausible futures of ecosystem services, as well as the policy instruments available for governing or managing ecosystem services.
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Carpenter et al. (2006) studied this question.
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