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Does anyone know about the methane emissions associated with this? It sounds like a cool / compelling way for individuals to sequester carbon but methane emissions from decomposition of the wood if they're anaerobic may dwarf the carbon gains (because methane is ~28x worse of a greenhouse gas than CO2).

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I'm not at all knowledgeable in this subject, but wouldn't those methane emissions occur, regardless of if this method is used?

It has to do with whether the wood is decomposing in the presence of oxygen or not--the bacteria that cause decomposition in anaerobic environments emit more methane than the bacteria that cause decomposition in aerobic environments.

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