A: feedstock use varies per pulp type.
Virgin pulps have higher feedstock use, but the bio-energy produced
during pulping is also accounted for. A tree ‘saved’ due to
recycling is not accounted for in this approach as there is no limit
to the amount of resources that can be used.
B: feedstock use is preset.
Because of the increasing pressure on biomass, we model a system
with resources constraints (wood). Virgin feedstock use is therefore,
for all three pulp types, preset at the same fixed level (the