Ok, I hadn't understood, that this new solution was only applicable only to the CO2 produced by combustion for which we can easily install an exhaust filter. Y

Ok, I hadn't understood, that this new solution was only applicable only to the CO2 produced by combustion for which we can easily install an exhaust filter. You quote this fraction at 75% : With some efforts we can get 75% reduction at 50$ per ton. What is the cost per ton to remove the CO2 from the atmosphere for the remaining 25%, and for the CO2 we already have emitted in the past ?