Overall, at a higher GHG emissions reduction, the carbon tax promotes a higher growth rate for credit gain and a lower growth rate for the penalty. By contrast, a lower GHG emissions reduction has an inverse trend. As such, increasing carbon tax brings the trade-off curves in an intersection at 23% GHG reduction, where the growth rate of cost is equivalent to that of product revenue. Notably, we analyzed here only the net profit from the CCU system, without considering how its economic performance would compare to a direct-emission system, which will become significantly less economic under the increasing carbon pricing scenario.