This is an international discussion group to exchange knowledge and experience on phosphorus sustainability, covering phosphorus use, impacts, resources and recycling, in agriculture, diet and nutrition, industry, chemistry, soil and water. It has been initiated by the European Sustainable Phosphorus Platform (ESPP)www.phosphorusplatform.eu/ and is managed by Arno Rosemarin (Stockholm Environment Institute www.sei-international.org ), with collaboration of the North American Partnership for Phosphorus Sustainability (NAPPS) https://sustainablep.asu.edu and the Global Phosphorus Research Initiative (GPRI)http://phosphorusfutures.net/.