The scale of environmental devastation caused by factory farms is huge and varied. Intensive animal breeding requires ever-growing quantities of water, animal feed, energy and chemical inputs (1). The concentration of thousands of animals creates an unmanageable amount of waste. The manure that is used as organic fertilizer in smaller holdings, becomes a dangerous pollutant. In many pig factory farms for example, the waste is dumped after being mixed with water in lagoons and then sprayed on croplands. This blend contains
