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I was already quite familiar to terra preta, not to scientific aspects around it. Anyway, maybe some solar "oven" could be a good way to avoid the need to waste other fuels while making charcoal that would be used to make terra preta, but for usage as a fuel I still consider raw wood to not be bad at all as it would be overall less energy-intensive even though its energy density is reported to be lower compared to charcoal.
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