[ghostbust555]

My problem is that a) the lignin will decay into C02 (what is the time frame on this? if its hundreds of years then maybe there is some merit here) but b) this implies that if a paper mill wanted to claim to be "carbon negative" they could simply build a warehouse and store lignin for a while before burning it. Furthermore, it implies that if I wanted to claim to be 1 million kgs carbon negative I can simply make a threat of starting a forest fire. If I then DON'T burn the forest I now can say I personally removed 1 million kgs of C02 from the atmosphere.

[haakonzen]

Yes - time and degradation is key. All evidence we have as of today suggests close to none degradation of the lignin, and if/when eventually some degradation happens (yet to happen on the roads we have from 14y back), sequestration downwards in the soil, from the deep stabilized road layer we have bound with lignin. This is a very important area for us to pioneer research on going forward to get completely right, thanks for all the comments here, it will help us sharpen our efforts.

[kroil]

Adding this one, we are spending a lot of time getting all the calculations on sequestrations right, here is some deeper information on this. https://carbonplan.org/research/ton-year-explainer