Sufficiently concentrated for use by humans Identified and physically accessible Available for fertilizer (minus substantial mine-to-field losses) Available to plants in soil solution Available for food (minus substantial field-to-food losses) Available for consumption (minus food waste) Economically, energetically, and geopolitically feasible to extract Focus | Phosphorus Paradox
No takes yet. Share an insight, caveat, or question.
Tim Lougheed (2011) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: