Although they could make a valuable contribution towards the achievement of the declared climate objectives, negative emission technologies have barely been applied to date. This is mainly attributable to the fact that the involved technological processes are still partly in their infancy, have not been fully researched, remain largely untested to date, are technically complex, extremely costly and cannot yet be put into practice on a large scale. In addition, questions remain concerning their potential environmental impact and the transport of CO2 to the storage sites – as well as the associated high additional need for (renewable) energy.