Perhaps the most alarming trend in mineral depletion, however, is phosphorus – an indispensable fertiliser in modern agriculture. While reserves of the chemical are far from low, only a fraction of it can ever be mined, meaning crop yields for 40 per cent of the world’s arable land are already constrained by its limited availability. Any shortage is particularly problematic in the broader context of declines in land productivity resulting from industrial agricultural methods which, in some places, have seen soil fertility fall by as much as 50 per cent. In 2014, researchers from the University
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