When large-scale farms confine thousands of animals, it creates a problem that doesn’t exist for farms where animals graze…. managing all the animal waste produced in confined spaces. Diary and hog farms produce so much manure that farmers end up using what’s known as a “lagoon and sprayfield system” to manage it. This explainer video from Vox takes us to North Carolina, a state that’s been battling the public health and environmental impact of hog lagoons for decades.