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The Lowdown on Topsoil: It's Disappearing 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 3 feet of topsoil -- the shallow skin of nutrient-rich matter that sustains most of our food and appears to play a critical role in supporting life on Earth.

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The Lowdown on Topsoil: It's Disappearing

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 3 feet of topsoil -- the shallow skin of nutrient-rich matter that sustains most of our food and appears to play a critical role in supporting life on Earth.