There is no place to store all that - and don't say depleted gas and oil wells since those are ruined as long term storage by whats been done to them to get the

There is no place to store all that - and don't say depleted gas and oil wells since those are ruined as long term storage by whats been done to them to get the oil or gas out. So you need to build the structures to keep 20km³ of liquefied CO2 each year (liquefying also takes energy).