Industry and the habits of urban man dominate the attention of environmentalists, but these familiar targets have rustic, yet serious, competition. The nation's 50 million pigs, 38 million cattle and 350 million chickens threaten other forms of life with vast quantities of bodily wastes. Livestock produce two billion tons of manure in the U.S. each year. In some states the situation has become so alarming that farmers, cattlemen and scientists are frantically searching for a way to clean up the landscape.
The problem is space. Just 15 years ago, the average steer in the U.S. had about 86,000 sq. ft. of open...
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