Nutrient-rich topsoil is being eroded much faster than it can be replenished, experts say.
Tom Paulson / Seattle Post-Intelligencer
SEATTLE -- The planet is getting skinned.
While many worry about the potential consequences of atmospheric warming, a few experts are trying to call attention to another global crisis quietly taking place under our feet.
Call it the thin brown line. Dirt. On average, the planet is covered with little more than three feet of topsoil -- the shallow skin of nutrient-rich matter that sustains most of our food and also appears to play a critical role in supporting life on Earth.
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