Technical processes for CO2 removal from the atmosphere and storing it underground or in durable products: The use of technical processes to remove CO2 from the atmosphere (DAC) is seen as the last but indispensable option to bring global greenhouse gas emissions first to net zero and then to negative values (IPCC 2022, IEA 2022, Prognos 2021). Avoidance, and where this is not possible reduction, of emissions is to be prioritized over DAC, as are nature-based solutions for CO2 removal. Nevertheless, it is assumed that DAC with a global capacity of gigatons of CO2 per year will be needed in perspective (Viebahn et al. 2019). Research and development must help reduce energy demand and costs, and a market ramp-up must be stimulated to make DAC available on an industrial scale. Captured CO2 is either stored in the geological subsurface (DACCS) or used for carbon-based products (DACCU). The permanence of the emplacement can be increased by mineralization of the CO2 in reactive rock layers, e.g., by the Carbfix process. (Snæbjörnsdóttir et al. 2020) In the case of DACCU, one can only speak of negative CO2 emissions if there is a long service life of the products. Otherwise, they are CO2-neutral approaches in the best case.