The document discusses doubling synthetic biofuel production through the addition of hydrogen from renewable energy. Currently, over half of biomass carbon is not utilized to make fuel due to hydrogen constraints. However, adding hydrogen from an external renewable source, such as electrolysis powered by wind or solar energy, could hydrogenate the surplus carbon into additional fuel. This could increase fuel output from biomass by 2.6 times, utilizing 79% of the biomass carbon rather than the current 31%. The approach has the potential to significantly increase sustainable fuel production to help decarbonize transportation.