the hellisheidi power station's emissions are being used by carbon capture and storage company carbfix, that's turning c02 to stone. it comes in directly from the power station and it enters that tower from the bottom here. then we inject cold water at the top and the c02 becomes dissolved in water. crucial to the process is this giant oversized sodastream—like tower. it makes sparkling water, then it's ready to be transported to our injection site. these metal igloos — or giant christmas puddings, depending how hungry you are — is where we start to get subterranean. here, the carbonated liquid is forced a kilometre underground, where it meets the volcanic basalt rock. basalt has a lot of the metal that is required to permanently bind the c02. so once it gets in contact with the basalt, it's gonna form stable carbonate minerals, where it will be permanently stored. so it is an ideal rock.