Where is all the phosphorus?
Phosphorus is contained in every living cell and is thus widespread on our planet. And yet, the depletion of the rare mineral resources of phosphate rock and the eutrophication of water courses indicate that humanity's unidirectional use of the element is unsustainable. Ideas for better phosphorus management are available, but a successful global strategy will require keeping track of the element's whereabouts. Michael Gross reports.