According to the lowest United Nations estimates,the globe will have two billion more people living on it by the year 2050.At that point,the population may actually shrink because,though life expectancy may continue to rise,the average number of children each person gives birth to is poised to drop below 2.1.What demographic variable might make the global population drop?

Question

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The average number of children each person gives birth to, also known as fertility, is the demographic variable that can make the global population drop. As mentioned in the passage, the UN estimates that by 2050, the average number of children per person will drop below 2.1, which will contribute to the population decreasing. None of the other choices listed (A, C, and D) directly relate to population growth or decline.

According to the Lowest United Nations Estimates,the Globe Will Have