Dams built in Oregon and California may be taken down due to impact on wildlife

For over a century, one of the most important salmon runs in the U.S. has had to contend with historic dams in Oregon and California. These dams have been responsible for the death of dozens of the thousands of salmon due to poorer water quality. Anna Werner takes a look for the CBS News series Eye on Earth: Our Planet in Peril.

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Видео Dams built in Oregon and California may be taken down due to impact on wildlife канала CBS Evening News