Technology solutions include Direct Air Capture (DAC) whereby CO2 is captured via chemical reactions. The captured CO2 can be injected underground for permanent storage in certain geologic formations or used in various products and applications. The advantages are its scalability, siting advantages and that it uses a fraction of the land requirement of Green Carbon solutions. Challenges include the costs, DAC is expensive due to CO2 being very dilute at 415ppm[22], which requires lots of energy to separate out. Presently DAC schemes are costing between $250 and $600/CO2e[23], significantly higher than present market pricing levels.