But it does reach a steady state. All the carbon we are releasing comes from a time when Lignin essential did not decompose at all. And we are releasing orders of magnitude more of it than current gets captured and stays captured. Even large intact rainforests do very little to actively capture CO2, they cycle it and they keep a large chunk of existing Carbon bound but they do not capture new Carbon from the atmosphere since they already reached a steady state between growth and decomposition.