The aviation non-C02 effects can be broken down into radiative forcing (RF] components from contrails and induced cirrus cloudiness, aerosols (black carbon and sulfate], water vapor, and possibly also surface albedo changes from feedstock cultivation (Myhre, et al 2013]. These effects are far more uncertain and less studied, in particular the effects of aerosols and cloudiness. The total anthropogenic RF from aviation have been estimated to be as high as 5% (compared to the 2% of anthropogenic CO2 emissions accounted for by aviation] (Lee et al, 2009], due to non-C02 effects. A traditional GHG inventory assessment may therefore not fully account for the actual climate impact of alternative jet fuels.