from the atmosphere and through chemical reactions the carbon dioxide is extracted. It is then heated and then changes to physical form. It can then be stored. Unlike trees, it is much faster to capture carbon dioxide in a DAC and the amount captured is measurable and controllable. In addition, less land and water use is required. The compressed carbon dioxide captured by a DAC can also be stored permanently underground. Unlike trees that bind carbon dioxide in the biomass which can burn up, be felled or get diseases. That risk does not exist with a DAC.