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SECTION 5 Supporting Materials and Worksheets 5.1 Supporting Material to Evaluate Potential Environmental Benefits of Alternative Jet Fuels The main potential environmental benefits of alternative jet fuels considered here are life-cycle greenhouse gas and particulate matter (PM2.5) emission reductions compared to conventional jet fuel (see Sections 2.4 and 3.5.2). The information provided in Table 4 and Figure 7 can be used for initial evaluation of both potential effects. For more details on this data, please refer to Appendix E. Another useful resource for quantifying PM2.5 benefits is currently in development through ACRP Project 02-23, "Alternative Fuels as a Means to Reduce PM2.5 Emissions at Airports." Please check the ACRP website for the status of this project at http://apps.trb.org/cmsfeed/TRBNet ProjectDisplay.asp?ProjectID=2794. Life-Cycle GHG Emissions Table 4. Life-cycle GHG emissions expressed as grams CO2 equivalent (g CO2e) per MJ of fuel energy content (adapted from Stratton, Wong, and Hileman 2010). Pathway Combustion Processing Feedstock Transport Transport Land-Use Recovery WTT CH4 Biomass WTT N20 Change Credit Total Fuel Crude to conventional jet fuel 0 4.2 1.5 5.5 0.8 73.2 0.1 2.3 0 87.5 Crude to ULS jet fuel 0 4.2 1.5 7.3 0.8 72.9 0.1 2.4 0 89.1 Oil sands to jet fuel 0 19 1.3 5.5 0.5 73.2 0.1 3.1 0 102.7 Oil shale to jet fuel 0 41.2 0.6 3.3 0.6 73.2 0.2 2.5 0 121.5 Natural gas to FT fuel 0 4.6 0 20.2 1.2 70.4 0 4.6 0 101 Coal to FT fuel with (without) 0 0.8 0.1 19.4 0.6 70.4 0 5.9 0 97.2 carbon capture (117.2) (5.7) (194.8) Switchgrass to FT fuel -222.7 6.4 0.6 152.1 0.5 70.4 0.2 10.3 -19.8 to 0 -2.0 to 17.7 Coal and switchgrass to FT fuel, -44.3 1.2 0.2 21.9 0.5 70.4 2 4.9 -3.9 to 0 53.0 to with carbon capture 56.9 Soy oil to HEFA/HRJ -70.5 20.1 1.2 10.3 0.6 70.4 3.6 1.3 0 to 527.2 37.0 to 564.2 48