Earlier quoted context omitted.
Burying bamboo or other biomass is not a particularly reliable or effective form of carbon sequestration. (Anywhere you bury it, it will decompose and most of the C02 removed from the atmosphere will wind up as CH4 + CO2.) Carbon sequestration is a very active area of research, but for the most part, you're looking at injecting liquid C02 or water with a very large amount of dissolved C02 into deep reservoirs. Ideall…
Instead of trying to bury it, grow more. Increasing the total living biomass would reduce CO2.
You need to move CO2 from the atmosphere into the geosphere. Biomass can do that (e.g. hydrocarbons), but it's inefficient (a lot of it goes back to the atmosphere) and slow. Carbonate precipitation is much more permanent, and it's something we can force to happen at a high rate.