Closing the nutrient loop.
D000383:Agriculture; D003247:Conservation of Natural Resources; D003710:Demography; D019049:Developed Countries; D003906:Developing Countries; D004463:Ecology; D004467:Economics; D004777:Environment; D005523:Food Supply; D006262:Health; D009747:Nutritional Physiological Phenomena; D011153:Population; D011154:Population Characteristics; D012424:Rural Population; D014505:Urban Population
Agriculture; Demographic Factors; Developed Countries; Developing Countries; Ecology; Economic Factors; Environment; Food Supply; Health; Macroeconomic Factors; Natural Resources; Nutrition; Population; Population Characteristics; Rural Population; Urban Population