As a thought experiment, we opted to illustrate how the learning curves may translate into costs in specific years and defined two extreme technology uptake scenarios (ESI Table ). In one scenario, we took the least aggressive DACS uptake possible from integrated assessment modelling to meet still the 2°C or 1.5°C scenarios based on analysis from the IEA, Realmonte et al., and Fuhrman et al. Meanwhile, the second scenario was based on the most aggressive possible DAC uptake to meet either the 1.5°C or 2°C scenarios using the analysis from the IEA and Fuhrman et al. Within these scenarios, we allowed for a 25% technology dominance or a 100% technology dominance to understand the effect of future DAC market share. To demonstrate the scenarios, the total DACS scale in 2050 varies from 0.01-11.9 Gt-CO2 year -1 , and in 2100 this increases to 1.8-31.6 Gt-CO2 year -1 .