Earth's growing nitrogen threat

With nitrogen, the family’s corn crop suddenly grew much higher and stronger, and produced full ears and big harvests. When fed to their cows and pigs, that high-quality corn produced far more milk and meat. As a result, the family bought more livestock – and the farm grew. “I remember Dad bringing the neighbors over to see how much greener and better the quality of the stalk was,” Mr. Lindsay says. “It was a really big deal then.”

It’s an even bigger deal today. Lindsay and his son farm 3,000 acres of corn and soybeans, using about 150 tons of nitrogen fertilizer annually. Farmers fromChina, Europe, and South America rely on nitrogen, too, to make ends meet and feed a growing world.