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...Seminar theory of ecosystem services speaker dr stephen polasky valuing nature economics and decision making by university minnesota introduction the past hundred years have seen major transformations in human ecological systems there has been a rapid rise economic activity with tenfold increase real value global gross domestic product gdp delong at same time millennium assessment found many negative environmental trends leading to declines majority reason for production goods economy deterioration provision is fact that market reward commodities are sold markets accounted but does not penalize anyone directly degradation leads reduction as kinzig et al recently wrote about you get what pay or alternatively don t ecosystems provide wide array people called though valuable most often no one actually pays their invisible makers whose decisions important impacts on environment because this tend ignore impact such distortions can result excessive functions reductions society poorer consequ...