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B Scientists have assessed 78 mountain s glacier-based water systems around the world and ranked the Asian water towers as the most threatened,according to a recently published study in the journal Nature. Scientists ranked the importance of the ewater systems s to neighbouring lowland communities while assessing the vulnera- bility(脆弱性)to future environmental and socioeconomic chan ges.These water systems,known as mountain water towers, store and transport water via glaciers,snowpacks,lakes and streams,therefore supplying invaluable water resources to 1.9 billion people globally. The scientists analyzed the various factors that influenced