Not all dirt is created equal, even here in the famously fertile Pennsylvania Dutch Country. Some soils are merely good, while others are flat-out miraculous, such as the remarkably talented black loam at the Rodale Institute experimental farm at Pennsylvania Dutch, boasts an eight-acre plot of "super soil" that not only grows the finest corn and soyabeans but also sucks pollution out of the air like a giant siphon. In a reverse of the "greenhouse effect," it drinks in carbon dioxide from cars and factories and stores it below the surface as carbon, the building material for future plants.