'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?

'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?

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The Klamath River is free of four huge dams for the first time in generations. But for the Yurok tribe, the river's restoration is only just beginning – starting with 18 billion seeds.