The past decade has seen a steep rise in the use of chemical sorbents that are cycled through sorption and desorption cycles for CO 2 removal from ultradilute gases such as air. Traditional modes of carbon capture such as precombustion and postcombustion CO 2 capture from large point sources can help slow the rate of increase of the atmospheric CO 2 concentration, but only the direct removal of CO 2 from the air, or “direct air capture” (DAC), can actually reduce the global atmospheric CO 2 concentration. With the global population increase driving continued increases in fossil fuel use, humanity’s primary reliance on fossil energy for the next several decades is assured. The increase in the global atmospheric CO 2 concentration resulting from over a century of combustion of fossil fuels has been associated with significant global climate change.
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