Imagine a freight train with every boxcar filled with topsoil, that train stretches around the planet. Now imagine it stretches around the planet 18 times over. That is how much soil we loose in the continental US per year! I heard this figure quoted in an interview with Penny Livingston Stark with the Permaculture Institute. She said it came from the Natural Resource Conservation Service at the Department of Agriculture.
Thanks to Treehugger.com for the graphic.
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