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This dairy is known as a "Confined Animal Feeding Operation" or CAFO. It will soon hold 1,500 dairy cows. The animals are kept indoors and are milked three times a day. (Photo by Mark Brush)

The way milk is produced has changed. A lot of dairy farms are much bigger and more efficient. They're often called factory farms. Mark Brush reports, neighbors of these farms say they're paying a high price for the cheap dairy products on your store shelves:

Find CAFOs on a Map

See the Iowa Air Quality Study

Pollution in the Heartland

Producer: Mark Brush
Release Date: November 12, 2007
Running Time: 5:20

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