A wide array of different diluted CO2 sources is potentially available for the application of combined aminebased carbon capture and biomethanation. The composition and quantity of flue gas highly depend on the specific industrial applications. The CO2 concentrations from combustions are primarily dependent on the type of fuel and the excess addition of atmospheric air added during combustion. An overview of typical CO2 concentrations in exhaust flue gas from a selection of different applications and associated level of emission in 2021 can be viewed in table . Currently, the largest conundrum in the implementation of carbon capture technologies is attributed to the technical challenge of the thermodynamically low driving force for separating the diluted concentrations of CO2 from the gas streams, which impedes cost-effective capture technologies. Based on Sherwood analyses 7,53