The human species may be more than 100,000 years old but the bulk of its numerical growth has come in just the last few decades: 2.6 billion of today's 5.6 billion people have been born since 1960.
the human species may be more than 100 000 years old but the bulk of its numerical growth has come in just the last few decades 2 6 billion of today s 5 6 billion people have been born since 1960