'Enhanced rock weathering' uses tiny volcanic rocks to capture the greenhouse gas carbon from the atmosphere.
BBC Environment Correspondent
Direct Air Capture , meanwhile, mechanically sucks CO2 out of the atmosphere and stores it underground; it's permanent - but does it make sense to build such an energy intensive process when we're trying to wean ourselves off fossil fuels? But the tiny pieces of basalt rock that are left over are prized by Jim's company. They have a useful property - when they weather in the rain they remove carbon dioxide from the atmosphere.The basalt rock of the quarry, has a useful property - when it weathers in the rain it removes carbon dioxide from the atmosphere
"It's free of charge which is quite important to a farmer," John Logan tells me with a chuckle as the basalt is put on his field. He'd seen UNDO's trials on a neighbouring farm. With a typical Brit's CO2 emissions estimated at about 7 tonnes a year that means each of us needs about thirty tonnes, or one and half trailer loads of basalt to be scattered annually just to break even.
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