First, it is unlikely that the costs of DACS will reach the aspired $100 t-CO2 -1 target. Our study forecasted that the costs will reduce, at the Gt-CO2 year -1 scale for a plant in the United States paired to nuclear electricity and a heat-pump for low-grade heat where applicable, to i) $90-440 t-CO2 -1 for KOH-Ca looping, ii) $450-1350 t-CO2 -1 for KOH BPMED, iii) $140-730 t-CO2 -1 for solid sorbent, and iv) $90-540 t-CO2 -1 for MgO ambient weathering. The lower bounds of these ranges are only attainable if very high learning rates are achieved (~15-19%), capital and energy are cheap (~$0.09 kWh -1 electricity and ~$3 GJ -1 natural gas ), and there is a very strong reduction in energy requirements (~45-65%).