According to GreenTech made in Germany,
"Biomass-to-liquid (BTL) fuels and bioethanol created by the enzymatic decomposition of cellulose are second-generation biofuels.
Unlike their first-generation predecessors (such as biodiesel, vegetable oils and bioethanol produced by traditional means), these new fuels can be extracted not only from agricultural produce but also from biological waste.
The energy yield per unit of space is twice as high in the second generation.
Net CO2 emissions are also far lower than in first-generation biofuels.
In addition, synthetic biofuels reduce particulate emissions even in older vehicles and without the need for technical modifications."
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