【Earth&Sky】水与粮食_英语听力练习mp3下载-科学-沪江听力酷

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【Earth&Sky】水与粮食

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Today, Ken Cassman at the University of Nebraska on the subject of water for food.Cassman is a professor of agronomy – the science of soil management and crop production. He said that more than two-thirds of the water humans use today is used to produce food. So Dr. Cassman asked: How can we grow even more food for the greater numbers of people expected on Earth in this 21 century – using the same or less water than we're using today? Dr. Cassman said [---1---] will be a big part of the answer.

The importance of irrigated agriculture is only going to increase because we only have so much good, arable land with suitable soil, and because we don't want to expand agriculture into the last remaining rainforests and [---2---].

[---3---]

At a large scale, we can think of systems that are completely integrated with real-time satellite image data, so that we're matching the supply of water [---4---] in timing space with the need of every plant on the large field.

But, he said, irrigated agriculture has to be [---5---].

That we have to do it in a way that protects water resources and protects water quality at the same time. if you put that challenge before talented young scientists, I guarantee it can be done.

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