Recent revisions of phosphate rock reserves and resources: a critique

  title={Recent revisions of phosphate rock reserves and resources: a critique},
  author={J. D. Edixhoven and Joyeeta Gupta and Hubert H. G. Savenije},
  journal={Earth System Dynamics Discussions},
Phosphate rock (PR) is a finite mineral indispensable for fertilizer production, while P (phosphorus) is a major pollutant if applied or discharged in excess, causing widespread eutrophication (Carpenter and Bennet, 2011). High-grade PR is obtained from deposits which took millions of years to form and which are gradually being depleted. Recently, global PR reserves as reported by the US Geological Survey (USGS) have increased from 16 000 Mt PR in 2010 to 65 000 Mt PR in 2011 and further to 67… 

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