Sequestration

Sequestration(5)
Opportunities to remove atmospheric CO2, either through biological processes (e.g. plants and trees), or geological processes through storage of CO2 in underground reservoirs.
Shear(6) ...

Other mechanisms that can cause atmosphere depletion are solar wind-induced sputtering, impact erosion, weathering, and sequestrationâ€"sometimes referred to as "freezing out"â€"into the regolith and polar caps.

See also: Water, Surface, Satellite, Oxygen, Light