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Enhanced weathering (EW) is a promising modification to current agriculturalpractices that uses crushed silicate rocks to drive carbon dioxide removal(CDR). If widely adopted on farmlands, it could help achieve net-zero ornegative emissions by 2050. We report detailed state-level analysis indicatingEW deployed on agricultural land could sequester 0.23-0.38 Gt CO$_2$ yr$^{-1}$and meet 36-60 % of U.S. technological CDR goals. Average CDR costs varybetween state, being highest in the first decades before declining to a rangeof $\sim\$$100-150 tCO$_2{}^{-1}$ by 2050, including for three states (Iowa,Illinois, and Indiana) that contribute most to total national CDR. We identifymultiple electoral swing states as being essential for scaling EW that are alsokey beneficiaries of the practice, indicating the need for strong bipartisansupport of this technology. Assessment the geochemical capacity of rivers andoceans to carry dissolved EW products from soil drainage suggests EW providessecure long-term CO$_2$ removal on intergenerational time scales. Weadditionally forecast mitigation of ground-level ozone increases expected withfuture climate change, as an indirect benefit of EW, and consequent avoidanceof yield reductions. Our assessment supports EW as a practical innovation forleveraging agriculture to enable positive action on climate change withadherence to federal environmental justice priorities. However, implementing astage-gating framework as upscaling proceeds to safeguard against environmentaland biodiversity concerns will be essential.

Transforming U.S. agriculture with crushed rock for CO$_2$ sequestration and increased production