Our studies have found that local rice production under irrigated conditions can be as competitive as in Asia and much cheaper than in the USA.

我们开展的研究发现，地方灌溉水稻生产的竞争力与亚洲相同，生产成本比美国要低得多。

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Over half of world's food comes from rain-fed farms, as opposed to irrigated ones.

世界粮食一半以上来自依靠雨水而非依靠灌溉的农田。

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The region has as much irrigated land as the United States, and a lot of it is used for crops that are more easily grown in other places and imported.

该地区的水浇地面积与美国相同，许多这样的土地都用来种植可以更容易地生长在别处和进口的作物。

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More than half of the world's food comes from rain-fed farms, as opposed to irrigated ones.

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Of course, rain-fed agriculture is even more vulnerable to climate change than the irrigated variety, as Ms Parcak's Cambridge colleague Lauren Ristvet showed the conference with her study of northern Syria during the same period as the fall of Egypt's Old Kingdom.

ECONOMIST: Climate change and civilisation

Partly as a result, the land irrigated by canals has decreased by 35% since 1990.

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