For DAC technology classification, we first screened available literature and collected information on the current state of DAC deployment. We assessed reported DAC process designs, input (e.g., materials, energy supply systems) and output (e.g., CO 2 product stream, waste) of DAC units, required equipment to enable DAC operation, required land and additional resources to enable DAC plant development, and current DAC companies and TRLs. The latest reported DAC process designs helped us classify the technologies by their capture mechanism and release driver (see Section 3).