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500 million humans live in the world's desert lands,more than the combined population of Europe.
五亿人口住在沙漠地带比欧洲人口还要多。
They know the value of water.
他们懂得水的价值。
They know how to use it sparingly.
他们也爱惜涓滴。
Here, they depend on wells replenished by fossil water.
在这里 他们依赖水井中的原生地层水。
Which accumulated underground in the days when it rained on these deserts.
它是由二万五千年前降于沙漠的雨水。
25,000 years ago.
聚集而成。
Fossil water also enables crops to be grown in the desert to provide food for local populations.
原生地层水令谷物得以在沙漠生长为当地人口提供食粮。
The fields' circular shape derives from the pipes that irrigate them around a central pivot.
圆形的农田由围绕中心的管道进行灌溉。
But there is a heavy price to pay.
但代价沉重的。
Fossil water is a nonrenewable resource.
原生地层水不可再生。
In Saudi Arabia, the dream of industrial farming in the desert has faded.
在沙地阿拉伯在沙漠作现代耕种的梦已褪。
As if on a parchment map,the light spots on this patchwork show abandoned plots.
这像一张羊皮纸地图,光点显示了被放弃的计划。
The irrigation equipment is still there.
灌溉设备仍在。
The energy to pump water also.
抽水的能量仍在。
But the fossil water reserves are severely depleted.
但原生地层水已严重枯竭。
Israel turned the desert into arable land.
以色列把沙漠变成耕地。
