water erosion Archives - Sustainablog

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Topsoil: Civilization’s Foundation Eroding

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 […]

September 29th