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Marine life returning to Green Harbor River

Humans have controlled the flow of Marshfield’s Green Harbor River for centuries. In the 1800s, at the behest of farmers who wanted more grazing land, a dike was built to limit how much tidal water flowed upstream into the river. It was the beginning of a slow loss of habitat as the river’s salt and oxygen dropped, but now, plant and animal species that sharply declined or disappeared are returning.

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