Earth System Dynamics
Earth System Dynamics
ESD
Articles | Volume 7, issue 1
Articles | Volume 7, issue 1
https://doi.org/10.5194/esd-7-103-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/esd-7-103-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 7, issue 1
Peer-reviewed comment
 | 
11 Feb 2016
Peer-reviewed comment |  | 11 Feb 2016

Comment on: "Recent revisions of phosphate rock reserves and resources: a critique" by Edixhoven et al. (2014) – clarifying comments and thoughts on key conceptions, conclusions and interpretation to allow for sustainable action

R. W. Scholz and F.-W. Wellmer

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Short summary
The 2014 USGS data could decrease from 67 Gt phosphate rock (PR) reserves to 58.5 Gt marketable PR (PR-M) if data on PR-ore are transferred to PR-M. The 50 Gt PR-M estimate for Moroccan reserves is reasonable. Geoeconomics suggests that large parts of resources and geopotential become future reserves. As phosphate is essential for food production and reserve data alone are unsufficient for assessing long-run supply security, an international standing committee may assess future PR accessibility.
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