Biofuel plant at sunset
A tour team checks soybean fields at the Charlie Bomgardner farm just outside Annville, Pa.
Steve Guack in soybean field
 Charly Triballeau/Pool/GettyImagesNews-GettyImagesAsiaPac-1152124310-800.jpg
marestail plants under soybeans
biodiesel plant
South Dakota soybean farmer Dawn Scheier feeds fish during her trip to Cambodia.
corn being planted