The problem with wood is that it's not in a thermodynamic minimum energy state. React with oxygen, or thermally decompose to lighter hydrocarbons -- and you will get CO2 coming back.
In contrast, the carbonate minerals from the reaction of CO2 with these silicates ARE thermodynamically stable. Even if left exposed on the surface of the Earth they will not release CO2 back into the atmosphere.
In contrast, the carbonate minerals from the reaction of CO2 with these silicates ARE thermodynamically stable. Even if left exposed on the surface of the Earth they will not release CO2 back into the atmosphere.