To a visitor, the hog houses down a dusty dirt road outside Magnolia, North Carolina look like any other hog houses.
Here in Duplin County, there are low-slung buildings like this one around every bend, filled with hundreds of thousands of hogs. But this facility is different—just how different can be found down the hill behind the building.
Manure, flowing from the hog house, falls out of a pipe and into an open-air cement tank. From here, it goes to a much larger, circular, blue tank called a digestor.