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Figure out what species of kind of bamboo grows the fastest, grow a shitton of it, bury and seal it in old coal mines
Had a similar thought. Not necessarily bamboo, but whatever plant offers the best time to carbon captured ratio. Then stash it in old mines (salt mines ideally), and flood the mines for additional assurance that decomposition won't happen. It doesn't scale well, I think, because you're dependent on the right conditions for storage, and creating storage places artificially doesn't sound like it would be very effective.
I find out about biochar recently, pyrolize anything(usually woody matter) and you can use it as an amendment to soil as it's high surface area holds water, nutrients and is a "hotel" for fungi and bacteria. It can also be used to absorb fertilizer runoff into rivers. You don't necessarily have to dump it into a mine. Because it's stable carbon it stays for 100s to 1000s years. Check out Terra pretta.
I think it's best if done locally. I just dig a cone pit and throw it in my compost.
throw it in pig shit = long term fertilizer Add it to cattle feed and reduce methane farts
I've run across the term biochar a few times recently, but didn't think anything of it. Thanks for prompting me to look into it seriously!