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POPSUSAF Test Flight Blend Of Jet Fuel + Coal-Based 'Synfuel' While synthetic fuel has the capacity to reduce our dependence on foreign oil, it could also double CO2 emissions produced by military flight. At the time of this writing, synfuel is made via Fischer-Tropsch process from either coal or natural gas to produce a somewhat cleaner burning but extremely greenhouse-gas intensive product. The Air Force may be underscoring a recently hyped green image, but it seems that economic considerations are largely at play here.