In this case, the combustion emissions of biojet are assumed to be negated by the uptake of CO2 during cultivation of the biomass, as opposed to a well-to-wake basis where the combustion emissions are included. The functional unit reported in the table is the commonly adopted g CO2 equivalent over a 100 year period per MJ of fuel. To compare the CO2 emissions from the alternative pathways, similar estimates for conventional fossil jet A-l are also listed.