Phosphorus saved our way of life — and now threatens to end it
Elizabeth Kolbert writes: In the fall of 1802, the German naturalist Alexander von Humboldt arrived in Callao, Peru’s major port, just west of Lima. Humboldt had timed his visit to coincide with a transit of Mercury, which he planned to observe through a three-foot telescope, in order to determine Lima’s longitude. He set up his instruments atop a fort on the waterfront, and then, with a few days to kill before the event, wandered the docks. A powerful stench emanating…