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There’s also kind of a history of biochar requiring a bunch of energy to move biomass to the retort, heat it up, and move it back to the field. Power all that with fossil fuels, and you can very easily end up emitting more than you remove.
At home on a small scale I have been doing it in a hole in the ground. So far it’s working out pretty well.
That’s fine. The issue comes when you try to use equipment to scale it up, and that equipment uses fossil fuels.
I saw a video recently with a guy using only a specific type of BBQ Charcoal https://yewtu.be/watch?v=5ZEGCFAEj3o