dams

Most of the world’s 58,000 biggest dams are crumbling, report warns

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From the Hoover Dam in Arizona to the Inguri Dam in Georgia, many of the world’s most famous dams are risk of collapsing, a worrying new report has warned. Most of the 58,700 largest dams worldwide were constructed between the 1930s and 1970s, making them between 50 and 90 years old.  However, most were only designed … Read more

Beavers were cutting trees for food ‘before they started building dams’

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Ancient Arctic beavers were cutting down trees for food four million years ago, long before they started building dams, a new study shows.  Scientists analysed bones of the extinct Dipoides beaver and plant fossils from Ellesmere Island in northern Canada to work out what the creatures ate.    Isotopic evidence indicates a diet of woody and … Read more