We must stabilize the world's population at eight billion by 2040.

我们必须在2040年前将世界人口稳定在80亿。

Still, the task of feeding the world's population in 2050 seems easily possible.

不过，2050年养活世界人口的任务似乎很容易实现。

It was because China had 22% of the world's population, but only 7% of its farmland.

这是因为中国拥有世界22%的人口，却只有7%的耕地。

Meanwhile, the world's population more than doubled from 3 billion between 1961 and 2007.

与此同时，从1961年到2007年，世界人口从30亿增加了一倍多。

The world's population is expected to grow from 6.8 billion today to 9.1 billion by 2050.

到2050年，世界人口预计将从现在的68亿增长到91亿。

Rice is eaten by half of the world's population.

世界上一半的人口吃大米。

That's a third of the world's population.

这就相当于世界人口的1/3。

What is the world's population now?

但是现在有更多的庄稼地，是吗?。

W how fast the world's population is increasing?

你知道世界人口增长有多快吗？

Since 1950, the world's population has almost tripled.

自1950以来 世界人口增长了接近一倍。