In the current context to preserve the environment, we chose to use the Life Cycle Assessment (LCA) to assess the environmental performances of energy systems for transport and in particular hydrogen energy whose been studied by the Group of Schools of Mines in the H2-PAC project. This LCA highlights the poor performances of the fuel cell manufacture of direct hydrogen and bioethanol-hydrogen patterns. This LCA also highlights the poor performances of gasoline and combustion hydrogen patterns related to the use of internal combustion engines. Because of the failure to take into account the spatial and temporal parameters in the characterization of local and regional environmental impacts, we have used the Site Dependent approach to develop a most relevant classification methodology based on two key points : the determination of the environmental concentration of the substance by the EUSES model and the determination of the relevance of the impact characterisation according to this concentration. We tested our new methodology of classification in order to reassess the local and regional impacts of three life cycle stages : the fuel cell manufacture, the use of gasoline and hydrogen engines. This reassessment has confirmed that the poor performances of the fuel cell manufacture but it questioned the strong contribution of emissions from the engines. The integration of spatial and temporal parameters for the assessment of these impacts provides a better understanding of the mobile emissions sources. On the sidelines of this environmental assessment, a risk analysis of direct hydrogen and gasoline patterns was realised under the dangerous image of hydrogen. This Life Cycle Risk Analysis shows that these two patterns present a similar risk even if the hydrogen storage seems problematic.
