Factory farms are:
- awful for the animals (e.g. physical abuse, intense confinement, stressful conditions, frustration of natural behaviors)
- destructive to the environment (e.g. manure lagoons, carbon dioxide, and high consumption of energy and water)
- dangerous to human health (e.g. pollution of water sources, pollution of air, overuse of antibiotics)
Here are some resources to learn more about it.
Information about inhumane conditions on factory farms.
Pew Commission on Industrial Farm Animal Production
See report, "Putting Meat on the Table," a project of the Pew Charitable Trusts Johns Hopkins Bloomberg School of Public Health.
Food and Agriculture Organization
See report way at the bottom, "Livestock's long shadow."