We have satellites that can track CO2 concentrations in the air[0], allegedly at high resolution. If you spread out weathering rock to, I dunno, a square a few

We have satellites that can track CO2 concentrations in the air[0], allegedly at high resolution. If you spread out weathering rock to, I dunno, a square a few kilometers to a side, a gradient in CO2 might be measurable? If you're objective is much more quantitative than that, it probably is a non starter. Unless you were maybe flowing air actively over a controlled system and could take measurements at the input and output grating. But that seems a bit much. [0]https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Carbon_dioxide_monitoring_satellite_given_the_shakes https://www.esa.int/Applications/Observing_the_Earth/Coperni...