Thickening Plots will soon be rather important. From Mother Jones’ The Last Taboo:
The miracle of the Green Revolution, which fed billions and provided the world a sense of limitless hope, also disguised four ominous truths about Earth’s limits. First, the revolution’s most effective agents, chemical fertilizers of nitrogen and phosphorus, are destined to run out, along with the natural resources used to produce them. Second, the fertilizers, pesticides, and herbicides that grew the food that enabled our enormous population growth in the 20th century bore expensive downstream costs in the form of polluted land, water, and air that now threaten life. Third, crop yields today are holding stubbornly stable and even beginning to fall in some places, despite increasing fertilizer use, in soils oversaturated with nitrogen.The Green Revolution’s duplicitous harvest—giving life with one hand, robbing life-support with the other—also masked a fourth ominous truth. We’re running out of topsoil, tossing it to the wind via mechanized agriculture and losing it to runoff and erosion.
Geomorphologist David Montgomery, author of Dirt: The Erosion of Civilizations and 2008 recipient of a MacArthur “genius” fellowship, calculates that human activities are eroding topsoil 10 times faster than it can be replenished. “Just when we need more soil to feed the 10 billion people of the future,” he says, “we’ll actually have less—only a quarter of an acre of cropland per person in 2050, versus the half-acre we use today on the most efficient farms.” Plus there’s little new land to bring into production: “We could, with crippling environmental costs, raze the Amazonian rainforests and reap 5 to 10 years of crops before the tropical soils failed. But the fertile prairies of the Midwest, northern China, and northern Europe are already plowed to capacity and shrinking.”
Fun Fact: Topsoil creation rates are now being included as measurements in many growing methods. Yeay. I’ll be testing that as well.
