On November 15, the 8 billionth person on the planet was born. Well, more or less. That was the date selected by United Nations demographers as the moment the world crossed its latest population milestone. The exact date is probably wrong—perhaps off by months or more—but there are roughly a billion more humans alive today than there were 11 years ago.
I hadn’t been paying close attention to the Day of 8 Billion. Milestones make good headlines, but concentrating on a few big numbers can obscure more revealing trends that really explain how the world has changed since there were just 7 billion of us. Here are two examples. The proportion
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