We can also use this global sensitivity analysis to assess the potential performance limits. The ranges of values used for each parameter are plausible, but it should be noted that an increase in one may lead Email: jpy1@hw.ac.uk RCCS, Heriot-Watt University to a decrease in another (e.g., an increase in the density via compaction of an adsorbent pellet would likely negatively impact mass transfer). On top of this, there are still huge uncertainties over the heat transfer coefficient as this is yet to be measured experimentally in a real DAC process. For this reason, it would not be fair to assess the potential limits of productivity based on our study. However, we can gain some insights into where energy consumption may go, while it should be noted that the exact combination of parameters that lead to this energy consumption may not be attainable. Conversely, an adsorbent and contactor design breakthrough may occur that allows for even lower values.