Under normal circumstances, it takes perhaps a generation for the birth rate to drop with increasing wealth, whereas carbon emissions go up very quickly.
在通常情况下，伴随着财富增长的生育率下降大约需要一代人的时间来实现，而碳排放则增长极为迅速。
Under normal circumstances, it takes perhaps a generation for the birth rate to drop with increasing wealth, whereas carbon emissions go up very quickly.
在通常情况下，伴随着财富增长的生育率下降大约需要一代人的时间来实现，而碳排放则增长极为迅速。
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