Factory farms provide abundant food, but environment suffers | PBS NewsHour

An industry once based on small, independent farms is evolving into large operations housing thousands of animals under one roof. The change is helping make beef, poultry and pork more affordable. But animal waste from the mega-farms has fouled waters.
— Read on www.pbs.org/newshour/economy/factory-farms-provide-abundant-food-but-environment-suffers