Carbon sequestration in basalts

I have just had a piece published in the Bulletin of the Atomic Scientists: ‘We’d have to finish one new facility every working day for the next 70 years’—Why carbon capture is no panacea . I’m not allowed to repost the whole article here, but it is open access on the Bulletin website.

I looked again at the outsized role that carbon capture and storage (CCS) along with Bioenergy Carbon Capture and Storage (BECCS) play in most of the IPCC 2 degree models. I have argued previously that the gigantic quantities of CO2 that need to be sequestered in geological reservoirs, according to these models, face huge obstacles in terms of scalability, financing, technical hurdles and public acceptance.

A recent paper in Science reported on a breakthrough experiment in Iceland in which CO2 (from a volcanic source) dissolved in water was injected into basalts at depths of 400-1000 metres. Using isotopic and chemical tracers, the researchers estimate that the CO2 had been mineralized into benign and stable carbonate minerals in the space of just two years. This was faster than suspected and, if this process turns out to be scalable, then sequestration in basalts would provide a solution to the need to monitor conventional sedimentary rock disposal sites for leakage over the long term. Continue reading