The thin layer of topsoil that covers the earth’s land surface was formed over long stretches of geological time as new soil formation exceeded the natural rate of erosion. Sometime within the last century, soil erosion began to exceed new soil formation. Now, nearly a third of the world’s cropland is losing topsoil faster than new soil is forming, reducing the land’s inherent fertility. Soil that was formed on a geological time scale is being lost on a human time scale.
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By Lester R. Brown The literature on soil erosion contains countless references to the “loss of protective vegetation.” Over the last half-century, clearcutting, overgrazing, and overplowing have removed so much of that protective cover that the world is quickly losing soil accumulated over long stretches of geological time (see “Civilization’s Foundation Eroding”). Preserving the biological […]
By Lester R. Brown The thin layer of topsoil that covers the planet’s land surface is the foundation of civilization. This soil, typically 6 inches or so deep, was formed over long stretches of geological time as new soil formation exceeded the natural rate of erosion. But sometime within the last century, as human and […]