The functional form of degradation not only provides insight into the specific mechanism, but it also impacts the carbon footprint and process cost of DAC. The extent of this impact depends on the initial capacity and decay constant (denoted as "k") associated with each functional form. In Fig. and, the carbon footprint and DAC cost of the three functional forms are compared, all with the same initial capacity, to highlight how different degradation forms affect the economic viability. In the case of linear degradation, a rapid decline in capacity is observed, resulting in a decrease in the carbon removal efficiency as the sorbent captures less CO2 with a comparable energy consumption. This impacts the cost per net tonne of CO2 and emphasizes the necessity of considering carbon footprint, as it can significantly influence the economic viability of DAC systems. As mentioned before, the extent of this impact varies significantly with the choice of energy source. The observed increase in carbon footprint and cost will be less pronounced when energy sources with low carbon emissions are utilized.