Comment by zdragnar
16 hours ago
Depending on the tree, freshly cut wood can have anywhere from 1:3 to 2:1 ratio of water to actual wood fiber.
So, unless we want to remove a massive amount of fresh water from the ecosystem, we also need to invest energy in drying out the wood well below natural humidity levels (transport to a desert maybe?) on top of electrifying what is currently a diesel and gas heavy industry (cutting and transporting logs with heavy machinery).
There's definitely lower hanging fruit for getting C02 out of the cycle.
You can make charcoal, you even get a little bit of energy out of it or can use the wood gas as chemical feedstock. It’s still completely impractical to scale to the gigatons we’d need to sequester.
Dumping wet wood--even very, very wet wood in a lake and sinking it to the bottom does not "remove a massive amount of fresh water from the ecosystem". It does not remove any fresh water from the ecosystem.
Sinking wood into a lake won't remove the carbon unless you have a very deep lake, and you'd need many, many of them to have any impact on the CO2 levels whatsoever. The scale of wood that would need to be harvested is far beyond dropping some logs in a lake.
They need to go into a deep enough pit where the methane produced from anerobic breakdown won't reach the atmosphere.
The conditions that created the lignite coal and peat simply aren't that easily reproducible, especially with large volume of wood (rather than ferns over thousands and millions of years).
So sink them in the ocean. Or better, burn off the hydrogen and use the energy to dry the wood, leaving the bulk of the carbon, and then mix that in with the soil.
Recreating the lignite era process could be as easy as genetically engineering an alternative,presently indigestable version of lignin.
But my point is that the claim above that sequestering wet wood will somehow take meaningful quantities of water (fresh or otherwise) out of the ecosystem is just plain silly.
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