The Intergovernmental Panel on Climate Change (IPCC) estimates that as of 2020 the limit for theemission of CO2 in net terms is 400 Gt if the increase in global surface air temperature is to belimited to 1.5°C with a probability of 67% (IPCC, 2021). This means that emission scenarios inline with this remaining carbon budget entail a median of 730 Gt atmospheric carbon dioxideremoval (CDR) by the end of the century in addition to globally coordinated deep emission cuts(Rogelj et al., 2018). Insufficient greenhouse-gas and (especially) non-CO2 mitigation wouldrequire larger amounts of CDR, as would the reduction of net uptake by carbon sinks.