The report focused on poor urban areas, where farms in or near cities supply relatively inexpensive food.

该报告关注的是贫穷的城市地区，在那里城内或靠近城市的农场提供相对廉价的食物。

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Say a prolonged drought causes major cities in the American Southeast or Southwest to run out of water; both regions have large urban populations pushing against upper limits of water supply.

比如，久旱将会耗尽美国东南或西南地区主要城市的水源，而这两个地区城市人口众多，这将使水供应达到极限。

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Some time in the coming decades, the shrinking of glaciers will cause a drop in the level of glacial runoff, reducing the supply of water to urban Chileans.

在未来几十年里的某个时候，冰山的消融会减少冰山径流，从而减少对智利城市居民的用水供应。

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Isolated businesses could not match the cost savings from compact urban supply chains.

ECONOMIST: Free exchange: Concrete gains | The

Six more years of Chavez could potentially push production even lower, which, in the context of a growing global, and specifically urban, population, means demand for oil should increase as supply is sliding.

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There is already a backlog of unserved urban populations, and the number of people in cities who lack access to improved water supply and sanitation is estimated to have grown some 20% since the Millennium Development Goals were established.

UNESCO: World Water Assessment Programme (WWAP)