The rolling crises of the past few years rendered visible so many vital commodities that plenty of us never gave much thought — nickel, silicon chips, lumber. The latest entrant into this camp: Fertilizer. Why it matters: Skyrocketing fertilizer costs — like those made from nitrogen, phosphorus and potassium (NPK) — are driving up food prices and, worse, threatening food security around the globe. State of play: Prices for NPK were up 125% in January from a year before, and […]