If you only burn the woodgas, you get 5kBtu/lb, theoretical byproduct of CO2+H2O, and ultimately carbon negative because that was recently photosynthesized CO2 and you're going to bury the charcoal. Besides the fact that fossil fuel is cheaper if you don't pay for the death of humanity, and the nitrogen getting in the way of the reaction, startup/shutdown smoke, cleaning tar out of everything, high labor of material handling, what's the downside?
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