There are now, however, more than 60 countries where the fertility rate is below replacement level. If this were true of all countries, the global population would start to decline after 2050 – a development that would surely be benign.
不过，现在有60多个国家的生育率低于更替水平。如果所有国家都这样，全球人口将在2050年之后开始减少——这样的情况绝对是有益的。