When my mother was born, there were fewer than 3bn people in the world. When I was born, there were almost 5bn, and when I gave birth to my daughter, there were 7.7bn. She may live to see the beginning of a new era: the point at which the number of people on the planet begins to decline.
我母亲出生时，全世界人口不到30亿。我出生时，全世界人口接近50亿。我生我女儿时，全世界人口达到77亿。我女儿在有生之年也许能看到一个新时代的开始：地球上的人口开始下降。
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