Charcoal is resistant to the natural decomposition that normally turns wood back into CO2. Therefore if you char wood then bury that charcoal, you don't need

Charcoal is resistant to the natural decomposition that normally turns wood back into CO2. Therefore if you char wood then bury that charcoal, you don't need to go deep underground to sequester the carbon. Burying charcoal in the topsoil can sequester that carbon for thousands of years or more. https://en.wikipedia.org/wiki/Pyrogenic_carbon_capture_and_storage https://en.wikipedia.org/wiki/Pyrogenic_carbon_capture_and_s...