Carbon capture cost is often reported as dollars per tonne of CO2 captured, but this metric overlooks the underlying carbon footprint, or associated carbon emissions, of the process. Including the carbon footprint in cost predictions is vital to accurately access the viability of various DAC technologies. In Fig. , we illustrate how sorbent degradation affects the carbon footprints of the sorbent, energy, and the combined total (sorbent + energy). Here, the sorbent is considered to be replaced all at once (en-masse), so the sorbent lifetime is equivalent to the replacement time. Specifically, a sorbent lifetime of 1 year indicates that all of the sorbent is replaced at 1-year intervals. The input parameters used for the economic analysis are provided in Table .