Bad federal policy and intensifying storms are washing away the rich dark soils in the Midwest that made this country an agricultural powerhouse and that remain the essential foundation of a healthy and sustainable food system in the future.
That’s the alarming finding of a new Environmental Working Group report that highlights innovative research by scientists at Iowa State University (ISU). The report is titled “Losing Ground,” and it shows in stark terms what industrial-scale crop production is doing to our soil and water in the Corn Belt.
http://www.grist.org/industrial-agriculture/2011-04-13-big-ag-washing-away-midwest-topsoil
Adorngeo's Blog 
Very nice video and very informative page.