Second generation biofules are biofuels produced from sustainable feedstock. Sustainabilty of a feedstock is defined among others by availability of the feedstock, impact on GHG emissions and impact on biodiversity and land use. Many second generation biofuels are under development such as Cellulosic ethanol, Algae fuel, biohydrogen, biomethanol, DMF, BioDME, Fischer-Tropsch diesel, biohydrogen diesel, mixed alcohols and wood diesel. This is from WIKIPEDIA

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