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eu european sustainable phosphorus platform phosphate eu-27 phosphorus kimo van dijk reduction nutrient management sustainable use food europe transistion food systems scenario analyses van dijk sps sustainable phosphorus summit 2014 psp phosphorus in soils and plants conference montpellier circular economy recycling resource scarcity reuse recovery donutss ottavia zoboli uncertainty sound data alliance european environmental agency substance flow analyses material system analyses phosphorus balance germany jrc berlin phosphorus flow analyses struvite livestock ash waste sector sewage sludge meat and bone meal crops fertilizer fertiliser espp policy sustainable development agriculture food processing mining manure biowaste interdisciplinary science eco duurzaamheid stadslandbouw arnhem permacultuur p imbalance austria p-imbalance iiasa globiom p-rock eurostat monitoring time series material flow analyses 2nd european sustainable phosphorus conference data