Given in terms of mass of substance to mass of carbon Limestone needs 2.3 Basalt 6 nothing on seaweed, unfortch (source: https://www.economist.com/special-r

Given in terms of mass of substance to mass of carbon Limestone needs 2.3 Basalt 6 nothing on seaweed, unfortch (source: https://www.economist.com/special-report/2023/11/20/carbon-dioxide-removal-options-are-multiplying https://www.economist.com/special-report/2023/11/20/carbon-d..., stick archive.is in front if you need to, I feel bad doing that directly as a customer)