Mineral mining: Going deep underground to protect what's above

More than 1,000m underground is one of Britain's deepest mines. But it's not coal they're mining in North Yorkshire. It's a mineral that could help fight climate change. <br /><br />On this week's ClimateCast, Tom Heap explores the tunnels way beneath the North Sea bed to find out if what lies under the ground can help protect the atmosphere above. <br /><br />He discovers how miners are extracting polyhalite, a fertiliser that emits 85% less emissions than its counterparts, and learns why a multi-billion pound project is under way to extract more. <br /><br />Above ground, he's joined by professor of soil erosion and conservation, Jane Rickson from Cranfield University, to discuss the state and significance of the ground beneath our feet.<br /><br />Producers: Emma Rae Woodhouse<br />Editor: Philly Beaumont