5.5 billion -- and growing.
Robey
B
B
D003247:Conservation of Natural Resources; D003906:Developing Countries; D004467:Economics; D004493:Education; D004777:Environment; D004787:Environmental Pollution; D011156:Population Density; D011158:Population Growth; D012106:Research; D012736:Sex Education; D013223:Statistics as Topic
Carrying Capacity; Developing Countries; Economic Factors; Education; Environment; Environmental Degradation; Environmental Pollution; Estimation Technics; Family Planning Education; Natural Resources; Overpopulation; Population Growth Estimation; Research Methodology