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In the fight against climate change the peatlands of the British Isles are one of our greatest assets. A healthy peat bog can absorb more carbon dioxide and store it for longer than forests of a similar size. But we're still destroying our peat at a frightening rate. It's mined for use by gardeners, it's burned in power stations, taken by traditional peat-cutters and ravaged by moorland fires.

In 'Costing the Earth' Tom Heap meets the people leading the fightback. He takes to the skies above the Peak District where helicopters are dropping rocks and heather brash onto remote hillsides to heal the wounds caused by two centuries of acid rain. He joins the teams blocking drains and planting pods of sphagnum moss in an effort to bring carbon-sucking life back to the blasted heaths of the peaks.

Producer: Alasdair Cross.