Costing the Earth

Wildlife-Friendly Motorways

Costing the Earth

Motorways kill animals. That's unavoidable. But can road builders minimise the death toll with badger tunnels, bat flyovers, and green bridges covered in plants rather than tarmac? Tom Heap travels to the Gwent Levels and the Netherlands to find out. Producer: Sarah Swadling.

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Costing the Earth

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