Look, the problem is real simple. Simple math says that we can do this:
Carbon(in atomosphere) + Carbon(biomass) + Carbon(underground) = Carbon(total on earth)
Biomass gets it's carbon from atomosphere, and releases (most) of it back to atmosphere, and hence not a real problem as it undergoes a stable cycle and is limited by the total carbon between the two. Even if it's form changes, it's not a real problem as the math shows it's inherently limited. Additionally, some carbon does escape this cycle and ends back in underground stores - but it's an extremely slow process.
The real problem is taking carbon from underground, and putting it into the atmosphere - via an unnaturally rapid process. Anything else, is comically trivial to the problem that is the fossil fuel industry.