World grain takes a spill.
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D000383:Agriculture; D003247:Conservation of Natural Resources; D003710:Demography; D004467:Economics; D004526:Efficiency; D004777:Environment; D004787:Environmental Pollution; D005523:Food Supply; D011153:Population; D011157:Population Dynamics; D011158:Population Growth
Agriculture; Demographic Factors; Economic Development; Economic Factors; Environment; Environmental Degradation; Environmental Pollution; Food Supply--changes; Land Supply; Macroeconomic Factors; Natural Resources; Population; Population Dynamics; Population Growth; Productivity--changes; Soil Degradation; World