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Figure 4 - Peak Phosphorus: Clarifying the Key Issues of a Vigorous Debate about Long-Term Phosphorus Security

Figure 4. Peak phosphorus curve indicating a peak in production by 2033, derived from US Geological Survey and industry data. Source: [1]. 
Peak phosphorus curve indicating a peak in production by 2033, derived from US Geological Survey and industry data. Source: [1]. 
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