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Four hundred top-decision makers listed the myriad looming threats to global security, including famine, terrorism, inequality, disease, poverty and climate change. Yet when we tried to address each diverse force, we found them all attached to one universal security risk: fresh water.

Four hundred top-decision makers listed the myriad looming threats to global security, including famine, terrorism, inequality, disease, poverty and climate change. Yet when we tried to address each diverse force, we