Dr. Niall Farrell:

It is zero-carbon net in that in the sense that it has been grown during its lifetime and CO2 has been taken in from the atmosphere, but then it releases carbon when it is produced. Assuming all the steps along the way are well thought-out and accounted for in respect to accounting, that is fine, but there is evidence to suggest that sometimes there can be creative accounting around that. That is something that needs to be borne in mind.