The technology is there. Companies like https://carbonengineering.com/ or https://www.climeworks.com/ develop filters for sucking CO2 out of the atmosphere. With their project in Island Climeworks claims to reduce the costs of currently around 500 US$/t CO2 towards a goal of 100 US$/t. With an estimated total of around 43,1 Gt CO2 emissions per year (source: https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_atmosphere#Anthropogenic_CO2_emissions), even a price tag of 500 US$/t per t CO2 comes down to a yearly extra effort of US$ 2.762,82 per capita for everyone on earth for the removal of the yearly CO2 footprint. Or, to turn it the other way round and mirror more precisely the imbalance in CO2 footprint between the rich and the poor world – wouldn’t it make sense to set up a fund for all people in the rich part willing to afford an extra 5.000-10.000 US$ tax per year for removal of man made CO2 and saving the planet for our children?
Ah, and the full cleanup: As each ppm CO2 in the atmosphere represents 7.82 Gt CO2 (which comfortably corresponds to the 7,8 billion people on earth), we know that each of us carries a load of currently 133 t man-made CO2 (413 ppm compared to 280 before the industrial revolution). So, total cleanup would burn down to a one-time investment of 66.500 US$ – at the high price tag. With future projection to bring it down to 13.300. Now go and buy a cheaper car next time and save some money for saving the world.
Besides: there’s also even a low tech approach… a new study published in https://www.nature.com/articles/s41586-020-2448-9 favors the use of grinded basalt to be spread over agricultural areas and claims a price tag of US$80-180 per t CO2.
Now, where’s the fund people can transfer money to to clean up their bad conscience?