Population change, resources and environment.
D003247:Conservation of Natural Resources; D003710:Demography; D019049:Developed Countries; D003906:Developing Countries; D004463:Ecology; D004467:Economics; D004777:Environment; D004787:Environmental Pollution; D005523:Food Supply; D011153:Population; D011157:Population Dynamics; D011158:Population Growth
Demographic Factors; Developed Countries; Developing Countries; Ecology; Economic Development; Economic Factors; Environment; Environmental Degradation; Environmental Pollution; Food Supply; Natural Resources; Population; Population Dynamics; Population Growth