Although the inventory results consist of an exhaustive list of parameters, only the
most important ones were selected to be presented and assessed: renewable energy
consumption, non-renewable energy consumption, non-renewable carbon dioxide
(CO2), nitrogen oxides (NOx), sulphur dioxide (SO2), chemical oxygen demand (COD)
and adsorbable organic halogens (AOX). Renewable CO2 emissions were excluded
from this analysis, because they were assumed to be in balance with CO2 sequestration
in the forest stage. Figure 1 shows the relative contribution of the several stages of the
life cycle to the inventory parameters. The contribution of the processes added to
the system boundaries in order to avoid allocation was considered separately in the
category called “credits”.