What to do when valuation of ecosystem services fails Frank J. Dietz 29 september 2011.

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Presentation transcript:

What to do when valuation of ecosystem services fails Frank J. Dietz 29 september 2011

Content Effects on nature in complex decisions Nature effects in cost-benefit analyses Making nature effects manageable in CBAs

Frank J. Dietz - Water Science Meets Policy - 29 Sept Complex decisions

Frank J. Dietz - Water Science Meets Policy - 29 Sept Complex decisions

Frank J. Dietz - Water Science Meets Policy - 29 Sept The importance of aggregation of information  Overload of information on dose-response relations  The need for aggregation and standardisation  Cost-benefit analysis

Frank J. Dietz - Water Science Meets Policy - 29 Sept Nature effects in CBAs  PM entry  Benefit transfers  Scores on an ordinal scale

Frank J. Dietz - Water Science Meets Policy - 29 Sept Making nature effects manageable in CBAs Species Weighted Nature Value Indicator depends on:  Quality of the ecosystem  Area that the ecosystem covers  Weighting factor related to rarity of (endangered) species NVI = Quality x Area x Weighting Factor

Frank J. Dietz - Water Science Meets Policy - 29 Sept Application of nature points in CBA Waterdunen Net costs Nature improvement Variant 116,4P.M. Variant 226,9P.M. Variant 314,4P.M.

Frank J. Dietz - Water Science Meets Policy - 29 Sept Application of nature points in CBA Waterdunen Net costs Nature Improvement (nature points) Variant 116,4180 Variant 226,9450 Variant 314,4180

Frank J. Dietz - Water Science Meets Policy - 29 Sept Application of nature points in CBA Waterdunen Net costs Nature Improvement (nature points) Nature points per mln euro’s Variant 116, Variant 226, Variant 314,

Frank J. Dietz - Water Science Meets Policy - 29 Sept Conclusions  Nature points does not solve the valuation problem …  … but it improves insight into trade-offs between changes to nature (points) and effects in euro’s  Improved measurement of nature effects could increase the usefulness of CBA as supporting instrument in the decision- making process Thanks for your attention !

What to do when valuation of ecosystem services fails Frank J. Dietz 29 september 2011

Frank J. Dietz - Water Science Meets Policy - 29 Sept Case: Closure Dam (Netherlands) Built in 1930’s Aim: safety 2010: Revision necessary Aim: to guarantee safety for decades to come Ambition: enhancing nature value (WFD, MSFD)

Frank J. Dietz - Water Science Meets Policy - 29 Sept Case: Closure Dam (Netherlands) Closure Dam

Frank J. Dietz - Water Science Meets Policy - 29 Sept Case: Closure Dam (Netherlands) IJssel Lake (freshwater) Wadden Sea (salt water, intertidal) Closure Dam

Frank J. Dietz - Water Science Meets Policy - 29 Sept Salt marshes Salinity Gradient & Fish Migration One-sided Nature Development Case: Closure Dam (Netherlands)

Frank J. Dietz - Water Science Meets Policy - 29 Sept Salt marshes Brackish water zone Salinity Gradient & Fish migration Salinity Gradient & Fish Migration Riparian zone Case: Closure Dam (Netherlands) Two-sided Nature Development

Frank J. Dietz - Water Science Meets Policy - 29 Sept Cost effectiveness of measures for the improvment of nature Total Costs (10 6 €) Nature Value Index (NVI) Cost effectiveness (NVI / 10 6 €) Safety only Nature development in IJssel Lake Nature development in Wadden Sea Fish passage only