Water quality for more than 700 million people could be significantly improved by adopting conservation practices in watersheds. And at least one in four cities examined would find such interventions financially viable, based solely on savings from avoided water-treatment costs.
这份名为“城市供水蓝图”的报告分析了534座城市及2，000个流域的供水状况，全面总结了能与传统基础设施相结合的潜在的自然解决方案。分析得出的结果令人信服。在流域内采取保护措施可以显著提升7亿人的用水质量。而且依据省下的水处理成本计算，将有四分之一的城市发现上述措施在经济上完全可行。