联合国中位预测表明，从现在到2050年，北美和南美总人口将再增加15—20 % ， 此后直到二十一世纪末都将保持稳定。
The United Nations median projection suggests that the total population of North and South America, after growing by another 15-20% between now and 2050, will remain roughly stable for the rest of the twenty-first century.