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题目材料：
More appropriate water pricing would promote the treatment and reuse of urban wastewater for agricultural irrigation and also encourage improvements in irrigation efficiency. Treatment and reuse is more expensive than most irrigation-related conservation and efficiency measures but often less expensive than developing new water sources. Wastewater contains nitrogen and phosphorus which can be pollutants when released to lakes and rivers but are nutrients when applied to farmland. Moreover, unlike many other water sources. treated wastewater will be both an expanding and fairly reliable supply, since urban water use will likely double by 2025. Many large cities located along coastlines currently dump their wastewater treated or untreated, into the ocean, rendering it unavailable for any other purpose and harming coastal marine life.
以上解析由 考满分老师提供。
