Soil processing
From apm
Soil is to a good part humic substances with a lot of quite stable polycyclic hydrocarbons. These quite stable polycyclic hydrocarbons can be very hard to burn to get CO2. Here turning them into CO2 is desired as all CO2 molecules are exactly identical and thus easier to process than random long chain tangles of complex hydrocarbons.
If the soil contains so much incombustible slack forming material (like aluminum rich clay or silica rich sand) that oxygen rich combustion is not possible, then a rock digestion chamber approach can be used instead.
The collected carbon can be transferred to the mechanosphere but gathering CO2 from the atmosphere instead will be preferable so long atmospheric CO2 levels are too high and rising.
