When you bury the carbon you are sequestering it out of the atmosphere for hundreds of years. A pound of carbon buried this way takes quite a bit of CO2 gas out of what's overhead.
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Step 1: Overview
Step 2: Prep & Materials
55 Gallon Drum, with Lid
Drum sealing ring
Dry Biomass - usually wood & wood chips, or dung
Hoe, rake, shovel
Dust mask, ear protection, eye protection
Heavy gloves, boots
Hose & nozzle
Metal cutting circ saw or hammer & chisel
Step 3: Make the charcoal
The drum has to sit on the fire for several hours. First steam comes out for 2 to 4 hours, as the water boils off. Then, volatile gases (VOC's) such as methane and hydrogen start blazing out of the slots like blowtorches, for 1 to 2 hours. When the gases have all flared off, there will be little or no smoke. The carbon will start to burn, sucking oxygen into the barrel. That's when you want to stop the process by rolling the drum off the fire and covering the slots with sand to starve the oxygen. Water helps too, since you're happy with wet charcoal.