The dilemma of overpopulation.
D000029:Abortion, Legal; D004190:Disasters; D005193:Family Planning Services; D005544:Forecasting; D006801:Humans; D007221:Industry; D011155:Population Control; D011156:Population Density; D011158:Population Growth; D012959:Socioeconomic Factors; D013245:Sterilization, Reproductive