Concentrated animal feeding operations (CAFOs), or factory farms, are the most rapidly growing system of farm animal production. The United Nations Food and Agriculture Organization (FAO) estimates that 80 percent of growth in the livestock sector now comes from these industrial production systems. CAFOs now account for 72 percent of poultry production, 43 percent of egg production, and 55 percent of pork production worldwide.
But CAFOs produce high levels of waste, use huge amounts of water and land for feed production, contribute to the spread of human and animal diseases, and play a role in biodiversity loss. Farm animal production also contributes to climate change: the industry accounts for an estimated 18 percent of the world’s greenhouse gas emissions, including 9 percent of the carbon dioxide, nearly 40 percent of the methane (a greenhouse gas 25 times more potent than carbon dioxide), and 65 percent of the nitrous oxide (300 times more potent as carbon dioxide).
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