题目内容

If action isn’t taken, as many as 7 million people in 60 countries could face water shortage by 2050.

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In large part, the answer lies in the development and large-scale application of relatively simple technologies.

However, two biggest components of the global water shortage are the pollution of drinking supplies with human waste, and the huge waste of water that is mainly in some agricultural practices.

The world’s environmental situation might be eased if we carefully deal with our waste.

Meanwhile, water used for agriculture accounts for more than two thirds of human’s use of water.