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Access to safe water remains a challenge for many parts of the world. More than two billion people still drink contaminated water, and 1.5 million people die each year from diarrhea. A new meta-analysis of 15 studies finds that water treatment reduces child mortality by about 30 percent, suggesting that water treatment is a highly cost-effective way of saving lives; every $35

Pascaline dupasAmanda glassmanMichael kremerPatrick amothStephen lubyDevelopment innovation labUniversity professor in economicsWoods instituteGlobal developmentWorld health organizationMinistry of healthStanford institute for economic policy researchStanford king center on global developmentUniversity of chicagoStanford universityUniversity professor