Trapped sediment in dams 'endangers' water supplies: UN

Thousands of the world's large dams are so clogged with sediment that they risk losing more than a quarter of their storage capacity by 2050, UN researchers said Wednesday, warning of the threat to water security.

Hurricane Lisa menaces Central America

The northern part of Central America was on high alert Wednesday for the passage of Hurricane Lisa, with warnings of devastating winds, downpours and flash floods also affecting Mexico's Yucatan peninsula.

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