The Natural Capital/Ecosystem Capital Accounting (ECA) project for Mauritius Implementation of SEEA-Ecosystem Capital Accounts in Mauritius Methodology.

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The Natural Capital/Ecosystem Capital Accounting (ECA) project for Mauritius Implementation of SEEA-Ecosystem Capital Accounts in Mauritius Methodology and data processing Jean-Louis WEBER Consultant European Environment Agency Scientific Committee Honorary Professor, School of Geography, University of Nottingham

National Accounts: SNA and SEEA SEEA Part 1 “Central Framework” SEEA Part 2 “Experimental Ecosystem Accounting” SEEA-EEA XXX SEEA-EEA YYY SNA The System of Environmental-Economic Accounts adopted by the UN Statistical Commission in 2012 (SEEA 2012) has been supplemented in 2013 by a volume on “Experimental Ecosystem Accounting”. The “Ecosystem Capital Accounts” (SEEA-ECA) under implementation in Europe are one of these experimentations. SEEA-ECA Ecosystem Capital Accounts Jean-Louis Weber, 19 July 2013

Land and Ecosystem Accounting

SEEA Experimental Ecosystem Accounting

Ecosystem accounts are based on spatial information (1)

Ecosystem accounts are based on spatial information (2)

Four specificities of SEEA-ECA 1.Economy and Ecosystem are taken as two interacting and co-evolving systems. There are two basic approaches to environmental accounting. The first one is the “extension of the production boundaries” where natural resources are defined according to their usefulness to the economy and their economic value, using real market prices or estimated by “shadow prices”. The second approach acknowledges that the interaction of the economy and Nature creates a liability for the economy to maintain the renewable natural capital in the same way it maintains the produced capital. The amount of this maintenance and restoration when needed cannot be limited to monetary values but must meet the physical needs of ecosystem. 2.SEEA-ECA aims at recording the resource which is accessible without ecosystem degradation, at measuring the degradation or the enhancement of the ecosystem capital due to human activities and at establishing an ecological balance-sheet to summarize the accountability 3.SEEA-ECA is an integrated framework which follows the general accounting rules of double- entry and quadruple-entry (SNA) accounting. It integrates various ecosystems (inland, sea and atmosphere/climate ecosystems) and ecosystems to the economy. 4.A common measurement unit or currency is defined to allow integration of the accounting framework The physical units presently used in environmental accounting are not fully additive and are limited to the quantitative dimension of natural resources. There is a need to create a composite unit to measure ecological values in the way the money measures the ecological values. In ECA, this unit is called “Ecosystem Capability Unit” (ECU) Jean-Louis Weber, 20July 2013

ECU: a composite currency to measure ecological value In physical accounts, measurements are made in basic units (tons, joules, m 3 or ha) which cannot be aggregated. These measurements have to converted to a special composite currency named ECU for ‘Ecosystem Capability Unit’. The price of one physical unit (e.g. 1 ton of biomass) in ECU expresses at the same time the intensity of use of the resource in terms of maximum sustainable yield and the direct and indirect impacts on ecosystem condition (e.g. water contamination or biodiversity loss, inversely ecosystem restoration). François 1st ( ), Ecu d'or au soleil du Dauphiné, Source : Münzen & Medaillen GmbH (DE) 1 ECU = 1 unit of accessible ecosystem resource Economic value: Quantity x Price (in money) Ecological Value: Quantity x Price-equivalent (in ECU) Jean-Louis Weber, 19 July 2013

Indexes of Accessible Carbon/ Biomass Indexes of Accessible Water Indexes of Accessible Landscape/ Biodiversity Services TEC: Total Ecosystem Capability (ECU) SUM / 3 Basic resource (e.g. tons of Carbon/ Biomass) X = ECU values per 1 km2 grid-cells SUM Calculation of Ecological Values in ECU & Total Ecosystem Potential (TEC) Jean-Louis Weber, 20July 2013 ECU- Prices Region Ecosystem

(TEC t+1) – (TEC t) TEC: Total Ecosystem Capability (ECU, year t) ECU-Prices year t Basic resource year t (e.g. tons of Carbon/ Biomass) X = ECU values per 1 km2 grid- cells, year t X = SUM t+1 t TEC change TEC: Total Ecosystem Capability (ECU, year t+1) ECU values per 1 km2 grid- cells, year t+1 ECU-Prices year t+1 Basic rerource year t+1 (e.g. tons of Carbon/ Biomass) Change in Total Ecosystem Potential (TEC): ecosystem capital degradation or enhancement In this case, there is degradation Jean-Louis Weber, 20July 2013

Land cover change accounts Systemic services/ biodiversity Biomass Water Geographical & statistical data infrastructure Systemic services/ biodiversity Biomass Water Systemic services/ biodiversity Biomass Water Ecological Balance Sheet (assets & debts) in ECU Valuation of Ecosystem Services (€) Estimation of Restoration Costs (€) ============ Use of natural resource by SNA economic sectors (physical units) Ecological Balance Sheet in € Adjustment of Final Demand (Full Cost) Consumption of Ecosystem Capital Ecosystem economic benefits of projects, policies and plans Social demand for ecosystem services Sectors’ liability to ecosystem degradation REST OF THE WORLD Flows embedded into tradeDomestic economy’s global impacts Total Ecosystem Capital Capability in ECU Sketch of Ecosystem Capital Accounts for a country with 3 ecosystems Jean-Louis Weber, 20July 2013

Landscape Ecological Potential change , by ecosystem landscape units Degradation National Accounts & Ecosystem Capital Accounts National Accounts: GDP, Final Demand, Balance Sheet Consumption of ecosystem capital (unpaid costs) & Adjustment of Final Demand (Full Price) Restoration costs Enhancement Balance sheet of ecological debts & credits in ECU Total Ecosystem Capital Capability in ECU Stocks 1990 Change Ecological sustainability of Value Added supported by ecosystem services Sustainability coefficients Jean-Louis Weber, 20July 2013

Spatial Integration of Environmental & Socio-Economic Data Mapping Socio-Economic Statistics Individual Sites Monitoring Sampling

Main data flows to compile ecosystem capital accounts Monitoring data. rasters Standard coefficients Monitoring data, samples Socio-economic statistics by regions Disaggregate & map Aggregate & map Aggregate & map Extrapolate Multiply Data input Data assimilation (1 ha or 1 km2 grid) Accounts integration, analysis and reporting

Production of the urban areas land cover layer from high resolution data on buildings, using smoothing (gaussian blur) techniques

The buildings Shapefile

The buildings raster (tif) 10 meters x 10 meters

The buildings Shp and Raster 10 m

Smoothing (blurring) with SAGA Gis/ Grid Filters/ User Defined Filter Input: raster 10 m, values 1 to 101 Filter Matrix (for gaussian blur at 10 pixels radius or 100 m, using a kernel of 21 x 21 cells): here Kernel_21_10

Sequence of treatments with SAGA GIS: Input: shapefile, scale circa 1/5000 or finer Raster (tif) at 10 meters Smoothed (Gaussian blur) raster, radius of 100 meters (kernel = 21)

The buildings raster smoothed at 100m (values in the neighbourhood)

Building raster, 10 m and smoothed at 100m (values in the neighbourhood)

Building Shp and smoothed tif (values in the neighbourhood)

Agglomeration/generalisation: cells > 20% of the smoothed value NB: cells are of 10 x 10 meters

Agglomeration/generalisation: shp and cells > 25% of the smoothed value NB: cells are of 10 x 10 meters – here, the threshold captures dispersed urban

Agglomeration/generalisation: shp and cells > 50% of the smoothed value NB: cells are of 10 x 10 meters – here, the threshold eliminates dispersed urban…

Provisional conclusion The 20% threshold seems a priori more appropriate for urban areas mapping. The same or different thresholds can be chosen for different classes (e.g. forêts, wetlands…) and in differnt geographical contexts. The urban layer will be overlaid and combined with the other layers on agriculture, forêts, natural zones. Smaller themes will be given priority to the larger ones in order to minimise the relative errors. Adjustments will be done accordingly. The method is to some extent a simulation of visual photo- interpretation.

Thank You ! Jean-Louis WEBER