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The recent development of biofuel production worldwide is closely linked to GHG savings objectives and to regional agricultural policies. Many existing studies intend to evaluate the net non renewable energy and GHG savings associated to the various biofuel production pathways. ...Many existing studies intend to evaluate the net non renewable energy and GHG savings associated to the various biofuel production pathways. However, there is no consensus on the results of those studies. ...The main explanations of variations among the results are the following: energy consumption and GHG emissions of the reference fossil pathway, data used for the representation of farming processes and biofuel production processes, accounting for carbon storage in agricultural soils, reference use of the land, choice of an allocation method in case of coproduction.

The results concern WTW non renewable energy consumptions, GHG emissions and local pollutant emissions. Local pollutant have a lower impact in the Natural Gas pathway than in the gasoline or diesel oil pathways. ...As a conclusion, the potential GHG emissions reduction derived from the European objective of 10% contribution of Natural Gas in the energy mix for transport sector is investigated. ...Related GHG emissions reduction could reach 4,5 Mt CO2 equivalent in 2010 in France, which represents around 30% of target of the total GHG emissions reduction supposed to be achieved in France in the transport sector by 2010.