The most overpopulated nation.
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D000569:Americas; D002980:Climate; D003247:Conservation of Natural Resources; D003710:Demography; D019049:Developed Countries; D004467:Economics; D004736:Energy-Generating Resources; D004777:Environment; D004787:Environmental Pollution; D017752:Greenhouse Effect; D009656:North America; D011153:Population; D011156:Population Density; D011157:Population Dynamics; D011158:Population Growth; D013672:Technology; D014481:United States
Americas; Climate; Consumption; Demographic Factors; Developed Countries; Economic Factors; Energy Supply; Environment; Environmental Degradation; Environmental Pollution; Global Warming; Macroeconomic Factors; Natural Resources; North America; Northern America; Optimum Population; Population; Population Dynamics; Population Size; Technology; United States; Zero Population Growth