title: Taking Stock: Phosphorus Supply from Natural and Anthropogenic Pools in the 21st Century.
authors.affiliation: Federal Office for Agriculture FOAG, Switzerland. Electronic address: andrea.ulrich@blw.admin.ch.
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Ulrich
keywords: Environmental health; Food security; Phosphorus; Recycling; Residual soil phosphorus century; Scarcity; Supply risk