Environmental impacts assessed on a per MJ basis include the 100 year global warming potential (GWP), fossil fuel use, and freshwater use.
The 100 year GWP is measured as CO2 equivalence by mass and is calculated using The Tool for the Reduction and Assessment of Chemicals and other environmental Impacts (TRACI)
Biogenic CO2 and nonbiogenic CO2are both included in the results. Biogenic CO2 refers to carbon that is part of the natural carbon cycle.
This includes CO2 in the poplar biomass and CO2produced from combustion of biomass.
Non-biogenic CO2 refers to CO2 emissions produced from fossil fuel combustion.