Pigs huddle atop grates that allow waste to drip through (left). On many hog farms, the waste runs into a storage lagoon (such as the one pictured above), from which it is pumped and sprayed on surrounding fields (top). In 1995 one such lagoon spilled into a nearby river, killing 10 million fish and contaminating drinking water. Last July North Carolina became the first state to ban building new lagoons on hog farms.
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