Several studies of the phosphorus cycle and the sustainability of phosphorus have been published (Malthus, 1798, von Liebig, 1843; Osborn, 1948; Vogt, 1948; Meadows et al., 1972, 1992, 2004; Daily and Ehrlich, 1992; Ehrlich et al., 1992; Daily et al., 1994; Evans, 1998; Sverdrup et al., 2006; Modin et al., 2007; Filippelli, 2008; Oelkers and Valsami-Jones, 2008; Turner, 2008; Cordell et al., 2009, 2011a,b; Hodson, 2010, Ehrlich and Ehrlich, 2013). The problem...

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