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A comment on Only 60 Years of Farming Left If Soil Degradation Continues. Parent comment

Re:Only 60 Years of Farming Left If Soil Degradation Continues by philipkglass on Friday December 15, 2017 @04:16PM (#15935212)
The units are for depth, similar to how precipitation is reported in mm. Naturally you'd also need to know the relevant area to find total volume.
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