City officials usually respond to such supply crises by upgrading their water infrastructure, namely, drilling, damming, and laying pipes. Every day, the world’s largest 100 cities move 3.2 million cubic meters of water more than 5,700 kilometers to address local water shortages or problems with pollution.
市政官员往往通过升级水利基础设施（也就是钻井、筑坝和铺设管道）来应对上述供水危机。每天，全球最大的100座城市都要将320万立方米水移动5,700多公里，以解决当地的水资源短缺和污染问题。但这种方法代价昂贵，只有最有钱的城市才用得起。这种方法还挑起城市管理者和环保主义者之间的矛盾，后者要求限制兴修水利，以缓解对森林和流域造成的压力。幸运的是，这种方法并非唯一。