Papapetrou et al. estimate that 100 TWh year -1 of recoverable low-temperature waste heat (<200°C) is available in the European Union, but this waste heat can also be utilised for space heating or efficiency Email: jpy1@hw.ac.uk RCCS, Heriot-Watt University gains if it is close to urban areas or other industries. If this waste heat could be utilised for solid sorbent DACS alone, this would only support ~37 Mt-CO2 year -1 of deployment, which is an unrealistically optimistic best-case scenario.