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by sbierwagen 635 days ago
To turn trees into lumber you have to cut them down, transport them to a sawmill, cut them to size, kiln dry them, transport them to the build site, build a house out of it, etc.

Underground sequestration has no transport, milling or kiln costs. Just cut down a bunch of trees, dig a trench where the trees used to be, and bury the trunks.