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Scientists are warning that the loss of soil from farm land is reaching crisis levels in some areas. Floods are a big problem too and trials are underway to see if building dams in hillside streams can slow down the flow. .

New research suggests that part of the answer to both problems may be supplied by skilled labour from the continent - European beavers. Our environment analyst Roger Harrabin reports from a beaver re-introduction experiment at a secret location in West Devon.

(Image: Beaver. Credit: PA)