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May 4, 2011 12:14 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/ettbgG-HpP4/visualizing-iowas-to.html
Visualizing Iowa's topsoil loss
These pillars—located outside a rest area off Highway 80 in Adair County, Iowa—represent the topsoil Iowa has lost since large-scale farming began 150 years ago. In the 19th century, Iowa had 14-16 inches of topsoil. Today, it has just 6-8 inches of the stuff, and more is being lost all the time. The irony: The very farms that are depleting the topsoil desperately need it, too. (Image: RDG)...
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/ettbgG-HpP4/visualizing-iowas-to.html
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