Fig. 1.

(A) Existing and planned ethanol biorefineries, saline aquifers, candidate CO₂ pipeline rights of way, and candidate injection sites in the United States. Lack of adequate sequestration capacity in proximity of existing biorefineries necessitates the construction of a CO₂ transportation network to achieve high levels of abatement. (B) Contour plot of modeled abatement costs and scales for CO₂ capture and compression for biorefineries (n = 216); 60% of fermentation CO₂ emissions are available for pipeline transport for under $25/tCO₂.