"Bevölkerungswachstum" . . "Einwanderung" . . "Alternde Bevölkerung" . . "Beschäftigung" . . "United States" . . "Welt" . . "Bevölkerungspolitik" . . "USA" . . . . . . "Population : opposing viewpoints" . . . . . . "Authors explore this issue along with other perennial population c oncerns, such as whether or not the growing human population poses a serious ecological threat."@en . "Authors explore this issue along with other perennial population c oncerns, such as whether or not the growing human population poses a serious ecological threat." . . . . . . . . . . . . . "Population opposing viewpoints"@en . . . . . . . . "Population" .