Virtually all Western Cultures are all close to, or under, the replacement birth rate (about 2.16 births per couple), so this message must be meant for Africa, Central and South America, and Asia.... which of course makes the authors racist, bigoted, and thus to be ignored by the Left.
Back in the early 80s, the left’s mantra was that it’s almost criminal “to bring a child into this world” at the time. Not so subtle promotion of abortion. A certain former California governor had become President.