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Abstract Cities are central to improving natural resource management globally. Instead of reinventing the wheel for each interlinked sustainability priority, we suggest synergising with, and learning from existing net-zero carbon initiatives to explicitly tackle another vital element: phosphorus. To achieve net-zero phosphorus actors must work together to (1) minimise loss flows out of the city, (2) maximise recycling flows from the city to agricultural lands, and (3) minimise the need for phosphorus in food production.