The GreatestnRevolutionnby Tobias J. LanznFood Is Different: Why We Must Getnthe WTO Out of Agriculturenbv Peter M. RossetnNew York: Zed Books; 163 pp., $17.50nMost people throughout the industrialnworld see cheap and readilynavailable food as simply another modernnamenit}', such as electricit)' or runningnwater. Few understand that agriculturenhas always been political . . .