Recovered paper based pulping (−1100 kgCO2/t) is
under these assumptions that the most favourable pulp type with
respect to CO2 emissions and even outperforms chemical pulping
(300 kgCO2/t). Within the current system boundaries, energy use
includes both process energy as well as feedstock energy and this
figure in both mechanical (48 GJ/t) and recovered pulping (22 GJ/t)
increases