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Despite doubling of yields of major grain crops since the 1950s, more than one in seven people suffer from malnutrition . Global population is growing; demand for food, especially meat, is increasing; much land most suitable for annual crops is already in use; and production of nonfood goods (e.g., biofuels) increasingly competes with food production for land . The best lands have soils at low or moderate risk of degradation under annual grain production but make up only 12.6% of global land area (16.5 million km²) . Supporting more than 50% of world population is another 43.7 million km² of marginal lands (33.5% of global land area), at high risk of degradation under annual grain production but otherwise capable of producing crops . Global food security depends on annual grains—cereals, oilseeds, and legumes—planted on almost 70% of croplands, which combined supply a similar portion of human calories …