The carbon goes back into the atmosphere if you burn it. If you just let it decay, turn into top soil, and ultimately become entombed by the surface of the Ear

The carbon goes back into the atmosphere if you burn it. If you just let it decay, turn into top soil, and ultimately become entombed by the surface of the Earth it will, ultimately, suffer the fate of most of the ancient plants we today burn in their carbon-storage form: underground oil.