In agricultural contexts, fine grained carbonate limestone (agricultural lime) is commonly applied to raise the pH of acidic soils. As the lime weathers, it may serve as a sink or source of carbon dioxide depending on the time frame considered, the extent of strong acid weathering, and the degree of secondary carbonate precipitation, among other factors. Weathering of a mole of carbonate can remove one mole of carbon dioxide. Any change in lime use because of a CDR deployment requires accounting for the corresponding change in carbon removal. Lime weathering efficiency may be reasonably well-known at sites that have applied lime for years, but tracking the fate of lime-derived carbon remains a challenge. If no liming occurs prior to a deployment, or the CDR deployment does not change liming behavior, the uncertainty of the liming counterfactual is not applicable.