  The possibility of direct air capture of CO$_2$ in Antarctica is discussed.
Because the concentration of H$_2$O in the atmosphere during the Antarctic
winter is extremely low, an installation for direct air capture could employ a
physisorption-based process, allowing, in principle, a very short
adsorption/desorption cycle time. The lower required binding allows more
options for materials for the sorbent. With a shorter cycle time, more resource
could be spent on structuring the sorbent to improve energy efficiency, for
example by improving its mass efficiency if desorption is driven thermally.
