We believe that inhomogeneous data quality has the strongest effect on prohibiting a fair comparison on energy-related costs illustrated in Figure . The most extreme example is Technology 2B. Humidity Swing produces a significantly less concentrated stream of CO 2 as a product (5%) than other technologies. It is expected that significant energy will be required to condense large amounts of water and to concentrate CO 2 so it can be plugged into current permanent storage options, or that alternative storage options for low-purity DAC have to be developed. Technology 2B also assumes that passive air flow is sufficient for allowing the atmospheric air to pass through the air contactor unit. If this is not the case, additional energy will be required.