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Rock on Soils is a project exploring whether spreading crushed rock onto agricultural land can capture large quantities of carbon in the ground. Taking carbon out of the air is a key part of the fight against climate change, and the rock that's used is a by-product of quarrying, so it's an exciting prospect. The EU-funded project is being led by the Scottish Organic Producers Association (SOPA), and a range of academic and farming partners. To find out more, Anna is speaking with Dunkeld beef and sheep farmer Alex Brewster, Doug Christie, who's got a partly-organic mixed farm in Leven in Fife, and Ehsam Jorat, a senior lecturer in geo-technical engineering at Abertay University.