Beneath every loaf of bread and every harvest lies a chain of dependencies that most people never see — and one of its quietest links, sulfur, is now under strain. As global oil production declines, the sulfur that refineries once yielded as an almost incidental byproduct is growing scarce, pushing up the cost of fertilizer and, by extension, the cost of food itself. This is not a crisis born of sudden catastrophe but of slow structural change — the kind that arrives without drama and departs without haste, reshaping the economics of agriculture for years to come.