Total net savings from using first-generation biodiesel as a transport fuel range from 25-82% (depending on the feedstock used), compared to diesel derived from crude oil Producing lignocellulosic biofuels offers greater greenhouse gas emissions savings than those obtained by first generation biofuels. Lignocellulosic biofuels can reduce greenhouse gas emissions by around 90% when compared with fossil petroleum, in contrast first generation biofuels were found to offer savings of 20-70% This is from WIKIPEDIA

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