"The world is facing irreversible water "bankruptcy", with billions of people struggling to cope with the consequences of decades of overuse as well as shrinking supplies from lakes, rivers, glaciers and wetlands, U.N. researchers said on Tuesday.

Nearly three-quarters of the global population live in countries classified as "water insecure" or "critically water insecure", and 4 billion people face severe water scarcity at least one month per year, the United Nations University Institute for Water, Environment and Health warned in a report.

"Many regions are living beyond their hydrological means, and many critical water systems are already bankrupt," said Kaveh Madani, lead author and director of the institute.

"By acknowledging the reality of water bankruptcy, we can finally make the hard choices that will protect people, economies and ecosystems," he said."

David Stanway reports for Reuters January 20, 2026. [2]