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alternatives American agriculture Barry Commoner Borgstrom Brady editor Caltech Population Program capacity to produce chemical fertilizers chemical pesticides corn Cornell University croplands current water David Pimentel decade demands depletion disposal ecologically sound economic ecosystem energy Environment environmental damage Environmental Protection Agency environmental quality expansion of harvested factor farm feed feedlot fertilizer applications fertilizer nutrients fertilizers and pesticides food needs food prices Food Processing Wastes food production system Green Revolution growth projection Series harvested acreage high-yield increased production inputs Iowa State University irrigation land legume livestock long-term major crops manure mental million acres million tons National Academy National Research Council National Symposium nitrogen Nyle organic residues percent pesticide applications plants Population growth projection potential Report require Resources runoff Scenario sewage treatment shortages side effects significant soil Symposium on Food tion U.S. Depart U.S. Environmental Protection U.S. Government Printing USDA Washington Waste Management water quality world food world grain reserves