The recycling system appeared to have the lowest GHG emissions amongst the six system models for newspaper and magazine scenarios. Regarding cardboard, incineration with the high level technology had the lowest GHG emissions but the recycling system had lower GHG emissions than the medium and low level incineration technologies and the bioethanol model. On the other hand, the office paper-to-bioethanol model had lower GHG emissions than the recycling model ‘OP-Virgin 3’ and the incineration model with the low level technology. This surprising result was because the ‘Virgin 3’ virgin paper production technology was a low impact technology and therefore, there were only few environmental savings when the virgin office paper produced using ‘Virgin 3’ is replaced by the recycled office paper. The inventory for ‘Virgin 3’ was adopted from a Swedish paper mill using raw wood and total free chlorine (TFC) technology with most of energy demand met internally. Moreover, in this paper mill, emitted fossil based CO2 was captured and sold to a nearby lime plant producing calcium carbonate.