First, you can "vent" CO2 outside of the plane of the ecliptic.
Second, you do not "vent" CO2 anyway. Why would you do that? It's stupid and wasteful. You just transform it into diamond and bury it inside the crust.
Second, you do not "vent" CO2 anyway. Why would you do that? It's stupid and wasteful. You just transform it into diamond and bury it inside the crust.