In contrast, the energy carbon footprint is influenced by sorbent degradation. In Fig. (left panel) when there is no sorbent degradation, the energy carbon footprint remains constant because the amount of energy to capture one tonne of CO2 does not change. However, when there is sorbent degradation (Fig. , right panel), the energy carbon footprint increases as the sorbent lifetime increases. As the sorbent degrades, more energy is required to capture one tonne of CO2 because less CO2 is captured in each cycle. There is a slight reduction in the total energy required as the sorbent degrades; the same amount of air is blown across the contactor (and thus the same blower energy), but the thermal energy will decrease slightly, as there will be less product to desorb as the contactor degrades. However, the reduction in CO2 captured is significantly more than the slight reduction in total energy, and thus the energy per tonne of CO2 (and energy climate change impact) increases.