1. Udelman, M. et al. 1994. Feeding 10 billion people in 2050. (Report by the Action Group on Food Security, World Resources Institute, Washington D.C).
2. Anonymous. 1992. FAO Yearbook (United Nations Food and Agriculture Organization, Rome).
3. Chrispeels, M.J.and Sadava, D.E. 1994. Plants, Genes and Agriculture (Jones and Bartlett, Boston), chapter 15.
4. The ability of technological advances to increase farming productivity with concomitant environmental benefits is illustrated by India's recent history with one crop affected significantly by the new technology of the Green Revolution. During the period 1961-66, Indian farmers required 13 million hectares to achieve wheat production levels of 0.83 tons per hectare. With the simultaneous adoption of genetically improved varieties and intensive crop management practices (including pest control and fertilization), production increased fivefold. Since the mid-1970s, the amount of land devoted to wheat production has leveled off at just over 20 million hectares. In the absence of these innovations, by 1991 an additional 42 million hectares would have been needed to achieve the same production level (P.E. Waggoner, How Much Land Can Ten Billion People Spare for Nature? Council for Agricultural Science and Technology, Ames, Iowa, 1994).