Out of thin air

Direct Air Capture (DAC) is a process in which carbon dioxide is extracted from the atmosphere by channeling airflow over absorbent materials.  Once they are saturated, the process is reversed and a concentrated stream of CO2 can be captured and injected underground in a process called sequestration.  

The challenge for DAC is that CO2 exists in the atmosphere in relatively tiny amounts, despite its impact on the climate.  This means that large volumes of air must pass over the absorbent materials for enough CO2 to be captured.

The World Economic Forum has a good description of how two of the leading companies in the DAC space operate and the video below from the Clean Energy Solutions Center which explains more about the technology and some of the main companies involved.

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